Best 21 Thermos Vacuum Bottles

 

UPSTYLE Portable Thermos Travel Mug Vacuum Cup Cute Cartoon Tiny Monster Vacuum Insulated Stainless Steel Thermos Flask Water Bottle Coffee Thermos Vacuum Flask Size 500 ml Big Mouth

UPSTYLE Portable Thermos Travel Mug Vacuum Cup Cute Cartoon Tiny Monster Vacuum Insulated Stainless Steel Thermos Flask Water Bottle Coffee Thermos Vacuum Flask Size 500 ml, Big Mouth

UPSTYLE Portable Thermos Travel Mug Vacuum Cup Cute Cartoon Tiny Monster Vacuum Insulated Stainless Steel Thermos Flask Water Bottle Coffee Thermos Vacuum Flask Size 500 ml, Big Mouth - The body surface using environmentally resin paint,and has cute tiny monster pattern, through the automatic point spraying technology, so that the adhesion of paint is strong, not easy to scrape off the paint anti slip bottom mat and reinforcement bottle bottom , the bottom used food grade pp material, make the anti-breaking performance more stronger, and can be used more longer. The bottle cover used food grade pp plastic and silicone gel, resistance high temperature, resistance aging, strong seal, durable used and unbreakable compact design takes up minimal space while maximizing capacity for effortless transport and storage, stays cool to the touch with hot liquids and is condensation-free with cold durable drinking lid-cup, can be used safe and more convenient, it’s without toxic substance. The vacuum cup interior and exterior is made of high quality 304 stainless steel, used the vacuun-seal technology and double-wall construction, vacuum insulation for maximum temperature retention, keeping drinks hot or cold for as long as 24 hrs it’s not easy to rust,corrosion and easy to clean. The top is the press type sealing plug,the bottle stopper made of food grade plastic, button switch, sealing operation, easy to dismantle, so perfect for pouring out hot liquid and the cover used silica gel seal ring, security leak proof seal the vaccum flask with high quality nylon rope, take conveniently when you have a travel or outdoor. Material 304 stainless steel + food grade plastic + food grade silica gel + nylon rope.

 

ZuriMug 17 oz 500 ml Double-Wall Thermal Stainless Steel Bottle - Thermos Water Bottle – Vacuum Water bottle with Tea Infuser - FDA Approved - BPA Free

ZuriMug 17 oz (500 ml) Double-Wall Thermal Stainless Steel Bottle – Thermos Water Bottle – Vacuum Water bottle with Tea Infuser – FDA Approved – BPA Free

ZuriMug 17 oz (500 ml) Double-Wall Thermal Stainless Steel Bottle – Thermos Water Bottle – Vacuum Water bottle with Tea Infuser – FDA Approved – BPA Free - Safe and eco friendly fda approved, bpa free (made from food grade, recyclable & reusable material ) and lid is top-rack dishwasher safe too making it easy to clean. Double wall vacuum insulated stainless steel construction that keeps your cold drinks icy cold and hot drinks steaming hot for up to 24 hours (hot up to 12) tea infuser for fruit-infused water and tea use the infuser to brew large-leaf loose teas right in the bottle and enjoy your favorite beverage. Excellent choice for gourmet coffee and tea lovers serves as an outstanding thermos for hot drinks when you’re on the go, whether you are in the office, gym, hiking, biking, camping or yoga it’s perfect for indoor/outdoor activities. Beautiful ergonomic design makes a great addition to and compliments your style, four different colors (red, blue, green and gold) to choose from making it a great unique gift for family and friends. 100% money back guarantee if you are not 100% satisfied with your stainless steel water bottle, we will refund or replace no questions asked go ahead, and buy the best travel coffee mug out there & make your life on the road so much easier, click ‘add to cart’ to order today.

 

Landrind Portable Thermos Travel Mug Cute Design Vacuum Insulated Stainless Steel Thermos Water Bottle Mini Size Coffee Thermos Vacuum Flask 400 mL Devil Wing Black

Landrind Portable Thermos Travel Mug Cute Design Vacuum Insulated Stainless Steel Thermos Water Bottle, Mini Size Coffee Thermos & Vacuum Flask (400 mL, Devil Wing & Black)

Landrind Portable Thermos Travel Mug Cute Design Vacuum Insulated Stainless Steel Thermos Water Bottle, Mini Size Coffee Thermos & Vacuum Flask (400 mL, Devil Wing & Black) - Constructed with double wall & 18/8 food grade stainless steel, fully-rugged and won’t rust. Moderate capacity, small size, convenient to carry really cute design, and variety of colors available. Features bpa-free,leakproof, condensation proof, insulated, thermal, twist off lid, stain-resistant. Hygienic, insulated, locking lid, removable stainless steel tea strainer, very simple and lovely shape. Vacuum insulation for maximum temperature retention, keeping drinks hot/cold for as long as 12 hrs.

 

DAMEI The Legend Of Zelda Breath Of The Wild Stainless Steel Mug  350mL Coffee Thermos Vacuum Flask Water Bottle by DAMEI Mug

DAMEI The Legend Of Zelda Breath Of The Wild Stainless Steel Mug / 350mL Coffee Thermos & Vacuum Flask Water Bottle by DAMEI Mug

DAMEI The Legend Of Zelda Breath Of The Wild Stainless Steel Mug / 350mL Coffee Thermos & Vacuum Flask Water Bottle by DAMEI Mug - Equipped with a one hand push button and a vertical safety lock which marked. Delivery time is 7-15 days,the express is usps. Silabeled with a open and close pouring button to ensure no leaks even this. Thermos stainless steel vacuum insulated flask travel mug beverage bottle no bpa for hot and cold. The legend of zelda breath of the wild mug is 350 ml.

 

DAMEI Star Trek Fiction Federal World Stainless Steel Mug  350mL Coffee Thermos Vacuum Flask Water Bottle

DAMEI Star Trek Fiction Federal World Stainless Steel Mug / 350mL Coffee Thermos & Vacuum Flask Water Bottle

DAMEI Star Trek Fiction Federal World Stainless Steel Mug / 350mL Coffee Thermos & Vacuum Flask Water Bottle - Equipped with a one hand push button and a vertical safety lock which marked. Delivery time is 7-15 days,the express is usps. Star trek fiction federal world mug is 350 ml. Silabeled with a open and close pouring button to ensure no leaks even this. Thermos stainless steel vacuum insulated flask travel mug beverage bottle no bpa for hot and cold.

 

UPSTYLE Portable Thermos Travel Mug Cute Couple Cats Design Vacuum Insulated Stainless Steel Thermos Water Bottle Coffee Thermos Vacuum Flask Size 17 oz Green

UPSTYLE Portable Thermos Travel Mug Cute Couple Cats Design Vacuum Insulated Stainless Steel Thermos Water Bottle Coffee Thermos Vacuum Flask Size 17 oz, (Green)

UPSTYLE Portable Thermos Travel Mug Cute Couple Cats Design Vacuum Insulated Stainless Steel Thermos Water Bottle Coffee Thermos Vacuum Flask Size 17 oz, (Green) - The top is the press type sealing plug,one button to closed the bottle stopper made of food grade pp, two silicone sealing ring, strong anti-aging button switch, sealing operation,easy to dismantle, so perfect for pouring out hot liquid and the cover used silica gel seal ring, security leak proof seal. The bottle cover used food grade pp plastic and silicone gel, resistance high temperature, resistance aging, strong seal, durable used and unbreakablecompact design takes up minimal space while maximizing capacity for effortless transport and storage, stays cool to the touch with hot liquids and is condensation-free with cold durable drinking lid-cup, can be used safe and more convenient, it’s without toxic substancethe lid-cup has a holder, easy to used and take out. Anti slip bottle bottom and the reinforcement bottom, make the anti-breaking performance more stronger, and the bottom used concave and convex design, make the vacuum cup steadily. Material made of stainless steel + food grade plastic + food grade silicone. The stainless steel interior and exterior is made of high quality food grade stainless steel, it’s anti-corrosion and rust prevention used the vacuun-seal technology and double-wall construction,vacuum insulation for maximum temperature retention, keeping drinks hot or cold for as long as 24 hrsit’s not easy to rust,corrosion and easy to clean.

 

DAMEI Nightmare Before Christmas Jack Skellington Stainless Steel Mug  350mL Coffee Thermos Vacuum Flask Water Bottle

DAMEI Nightmare Before Christmas Jack Skellington Stainless Steel Mug / 350mL Coffee Thermos & Vacuum Flask Water Bottle

DAMEI Nightmare Before Christmas Jack Skellington Stainless Steel Mug / 350mL Coffee Thermos & Vacuum Flask Water Bottle - Nightmare before christmas jack skellington mug is 350 ml. Delivery time is 7-15 days,the express is usps. Equipped with a one hand push button and a vertical safety lock which marked. Silabeled with a open and close pouring button to ensure no leaks even this. Thermos stainless steel vacuum insulated flask travel mug beverage bottle no bpa for hot and cold.

 

UPSTYLE Portable Thermos Travel Mug Cute Cartoon Design Vacuum Insulated Stainless Steel Thermos Water Bottle Thermos Vacuum Flask Size 12 oz 350 ml Pink

UPSTYLE Portable Thermos Travel Mug Cute Cartoon Design Vacuum Insulated Stainless Steel Thermos Water Bottle Thermos Vacuum Flask Size 12 oz (350 ml), Pink

UPSTYLE Portable Thermos Travel Mug Cute Cartoon Design Vacuum Insulated Stainless Steel Thermos Water Bottle Thermos Vacuum Flask Size 12 oz (350 ml), Pink - Material made of stainless steel + food grade plastic + food grade silicone. Anti slip bottle bottom and the reinforcement bottom, make the anti-breaking performance more stronger, and the bottom used concave and convex design, make the vacuum cup steadily. The bottle cover used food grade pp plastic and silicone gel, resistance high temperature, resistance aging, strong seal, durable used and unbreakablecompact design takes up minimal space while maximizing capacity for effortless transport and storage, stays cool to the touch with hot liquids and is condensation-free with cold durable drinking lid-cup, can be used safe and more convenient, it’s without toxic substancethe lid-cup has a holder, easy to used and take out. The stainless steel interior and exterior is made of high quality food grade stainless steel, it’s anti-corrosion and rust prevention used the vacuun-seal technology and double-wall construction,vacuum insulation for maximum temperature retention, keeping drinks hot or cold for as long as 24 hrsit’s not easy to rust,corrosion and easy to clean. The top is the press type sealing plug,one button to closed the bottle stopper made of food grade pp, two silicone sealing ring, strong anti-aging button switch, sealing operation,easy to dismantle, so perfect for pouring out hot liquid and the cover used silica gel seal ring, security leak proof seal.

 

UPSTYLE Thermos Travel Mug Fashion Design Vacuum Insulated Stainless Steel Thermos Water Bottle Coffee Thermos Vacuum Flask Vacuum Cup for Men Women Adult Size 450 ml Purple

UPSTYLE Thermos Travel Mug Fashion Design Vacuum Insulated Stainless Steel Thermos Water Bottle Coffee Thermos Vacuum Flask Vacuum Cup for Men, Women, Adult Size 450 ml, Purple

UPSTYLE Thermos Travel Mug Fashion Design Vacuum Insulated Stainless Steel Thermos Water Bottle Coffee Thermos Vacuum Flask Vacuum Cup for Men, Women, Adult Size 450 ml, Purple - Material made of 304 stainless steel + food grade plastic + food grade silicone. The stainless steel interior and exterior is made of high quality food grade stainless steel, an electrolytic polishing layer, it’s anti-corrosion and rust prevention used the vacuun-seal technology and double-wall construction,vacuum insulation for maximum temperature retention, high vacuum heat insulation layer, keeping drinks hot or cold for 24 hrs it’s not easy to rust, and easy to clean 304 stainless steel is more environmental. The cup cover used food grade pp plastic and silicone gel, resistance high temperature, resistance aging, strong seal the lid inner has seal silicone, can make the lid more tight and leak proof and the lid top has a storage space, you can open it and put something you like into it. The body surface using environmentally friendly resin paint, through the automatic point spraying technology, so that the adhesion of paint is strong, not easy to scrape off the paint anti slip bottle bottom, the bottom used silicone, non-slip and wearability, make the anti-breaking performance more stronger, and can be used more longer. In the outlet has a anti scald ring, made of food grade plastic, can prevent you hurt when you drink water.

 

Thermos Vacuum Flask Thermos Vacuum Bottle Vacuum Thermos BEHAPPY Brand Thermos 34 Ounce Vacuum Insulated Stainless Steel Carafe

Thermos Vacuum Flask Thermos Vacuum Bottle Vacuum Thermos BEHAPPY Brand Thermos 34 Ounce Vacuum Insulated Stainless Steel Carafe

Thermos Vacuum Flask Thermos Vacuum Bottle Vacuum Thermos BEHAPPY Brand Thermos 34 Ounce Vacuum Insulated Stainless Steel Carafe - Base of high quality stainless steel,fully molding process,shockproof rounded corners,sliding and beautiful. Double wall stainless steel vacuum insulation made from food grade 304 steel,locking in temperature to keep beverages hot or cold for about 24 hours. Suitable for coffee,water,milk,juice,wine and tea,keep cold or hot for about 24 hours. Drip proof design’s spout,pot lid material is food grade silica gel,handle material is zinc alloy,thickening base,stainless steel liner. 100% brand new and high quality,stainless steel cladding,health and safety,anti-bacterial corrosioneasy to clean and healthier.

 

Swig Savvy Water Bottles Stainless Steel - Vacuum Insulated Water Bottle  Stainless Steel Leak Sweat proof Cap Double Wall Thermos Flask For Hot or cold Beverages Pink 30oz

Swig Savvy Water Bottles Stainless Steel – Vacuum Insulated Water Bottle + Stainless Steel Leak & Sweat proof Cap Double Wall Thermos Flask For Hot or cold Beverages (Pink, 30oz)

Swig Savvy Water Bottles Stainless Steel – Vacuum Insulated Water Bottle + Stainless Steel Leak & Sweat proof Cap Double Wall Thermos Flask For Hot or cold Beverages (Pink, 30oz) - Powder-coated, durable finish -our bottles have a stylish look and durable exterior that’s designed to last it features a practical wide-opening design for easy holding, refilling, pouring and drinking. The perfect solution for your hot & cold bottling needs, swig savvy’s vacuum-insulated water bottles are made of high-quality food-grade 18/8 stainless steel, protecting the quality and temperature of the stored liquids free of bpa and phthalates, the heavy-duty interior coating repels lingering flavors to enable constant reuse without any after-tastes. Sweat-free double-walled stainless steel- the bottle will keep its contents cool such as freezing cold fluids or ice cold for up to 24 hours perfect for staying hydrated while hiking travelling during sports and workouts. Stainless steel leak-proof lid, unlike other companies, swig savvy’s bottle features an stainless-steel lid so your liquids won’t come in contact with any plastics the air-tight seal lets you safely take a refreshingly cold or invigorating warm drink with you while traveling, at the gym or wherever else you go. Keep liquids hot for up to 12 hours you can now take your coffee, hot drink or even hot soup with you to and enjoy it at temperatures you expect send them to school with your kids to give your child a taste of home and a nutritious, filling warm drink or meal.

 

Penguin Animal Stainless Steel Thermos Vacuum Bottle Water Cup Travel MugFlask for Kids - 280ml Black

Penguin Animal Stainless Steel Thermos Vacuum Bottle Water Cup Travel Mug/Flask for Kids – 280ml |Black

Penguin Animal Stainless Steel Thermos Vacuum Bottle Water Cup Travel Mug/Flask for Kids – 280ml |Black - 5 oz shipping weight 1. 5-ounce thermos water bottle is a stylish way to take water, or other refreshing drink away. The 9. Unique cute penguin design theromos water bottle is a perfect gift for kids. Product specification product dimensions 9. 0 kg occasion home & kitchen.

 

450ML VIASA Business Insulation Cup Stainless Steel Vacuum Thermos Tea Cup Water Bottle Hot Pink

450ML VIASA Business Insulation Cup Stainless Steel Vacuum Thermos Tea Cup Water Bottle (Hot Pink)

450ML VIASA Business Insulation Cup Stainless Steel Vacuum Thermos Tea Cup Water Bottle (Hot Pink) - Materials high-quality 304 stainless steel + food grade abs. Cup body high-grade paint wear. Size 66235cm , capacity 450ml. Cover food grade pp. Insulation properties 12 hours (water temperature higher than 50 degrees celsius or water temperature lower than 15 degrees celsius).

 

Thermos 33105A 17 Oz Vacuum Bottle Assorted colors

Thermos 33105A 17 Oz. Vacuum Bottle Assorted colors

Thermos 33105A 17 Oz. Vacuum Bottle Assorted colors - Important note buyers may get any color and the color on the image is only indicative. “Thermos llc” arc series beverage bottle,16-ounce capacity,glass vacuum insulated for maximum temperature retention,hot or cold,.

 

New Penguin Style Stainless Steel Thermos Vacuum Bottle Water Cup Travel Mug

New Penguin Style Stainless Steel Thermos Vacuum Bottle Water Cup Travel Mug

New Penguin Style Stainless Steel Thermos Vacuum Bottle Water Cup Travel Mug - Attention- hand wash recommended, do not use abrasive cleaning products or microwave. Fashion- cute penguin design water bottle is a perfect gift for kids. Convenient- ideal choice for home, school, travel use, portable design to carry around easily and carry for milk, coffee, tea, juice, water, etc. Durable- good heat resistance and low temperature resistance, screw-on, leak-proof lid. Healthy-745oz water bottle, made from high stainless steel interior and tpe/abs material exterior, abs lid.

 

Insulated Water Bottle  Double Walled Stainless Steel Vacuum  Hot Cold Drinks  Extremely Durable Construction  No leaking Or Sweating  17 oz Large Capacity ThermosCola Bottle  by Hydronk

Insulated Water Bottle | Double Walled Stainless Steel Vacuum | Hot & Cold Drinks | Extremely Durable Construction | No leaking Or Sweating | 17 oz. Large Capacity Thermos/Cola Bottle | by Hydronk

Insulated Water Bottle | Double Walled Stainless Steel Vacuum | Hot & Cold Drinks | Extremely Durable Construction | No leaking Or Sweating | 17 oz. Large Capacity Thermos/Cola Bottle | by Hydronk - Stops spills say good-bye to spilling your drink on your shirt because of sloshing the narrow mouth making it perfect to drink out of while being large enough for filling with ice cubes. Versatile enough for all your drinking needs this bottle will keep your beverage the same temperature for a long time and the narrow mouth makes it easy to drink out of on the go this is perfect for the gym, office, road trips, sporting events, picnics, use at home and so much more. Totally leak proof & sweat-free thermos the exterior will never sweat don’t worry about getting water on your desk, rings on your table, or a mess in your bag the leak proof bottle won’t even be hot or cold to the touch no matter the temperature of the liquid. Double vacuum insulated bottle for hot & cold drinks the double-walled vacuum insulated exterior will keep your coffee warm for up to 12 hours hitting the beach maybe fill this bottle with iced water and quench your thirst for the rest of the day cold water 24/7 the twist on lid is also double-walled, adding extra insulation to your drink •. Colorful, durable stainless steel hydronk has made this bottle to be extremely durable made from premium gauge 18/10 stainless steel, this bottle is crack resistant and will not break, sure to be around for a long time plus, this comes in 5 great colors this fda approved water flask will also never rust or leave a bad metal taste in your mouth.

 

UPSTYLE Movie Pattern Stainless Steel Travel Mug Vacuum Insulated Mug Thermos Vacuum Bottle for Coffee Tea Size 12oz 350ml Blue

UPSTYLE Movie Pattern Stainless Steel Travel Mug Vacuum Insulated Mug Thermos Vacuum Bottle for Coffee, Tea Size 12oz (350ml), Blue

UPSTYLE Movie Pattern Stainless Steel Travel Mug Vacuum Insulated Mug Thermos Vacuum Bottle for Coffee, Tea Size 12oz (350ml), Blue - The cup cover is double layer plating, used food grade pp plastic and silicone gel, resistance high temperature, resistance aging, strong seal the lid inner has seal silicone, can make the lid more tight and leak proof and the lid top has a storage space, you can open it and put something you like into it, good seal and bpa free, can be removable and easy to wash. The stainless steel interior and exterior is made of high quality food grade stainless steel, an electrolytic polishing layer, it’s anti-corrosion and rust prevention used the vacuun-seal technology and double-wall construction,vacuum insulation for maximum temperature retention, high vacuum heat insulation layer, keeping drinks hot or cold for 24 hrs it’s not easy to rust, and easy to clean 304 stainless steel is more environmental. In the outlet has a anti scald ring, made of food grade pp, can prevent you hurt when you drink water and it’s can be removable. The body surface using environmentally friendly resin paint, through the automatic point spraying technology, so that the adhesion of paint is strong, not easy to scrape off the paint, and in the surface has fashion illustrations, anti slip bottle bottom, the bottom used silicone, non-slip and wearability, make the anti-breaking performance more stronger, and can be used more longer. Material made of 304 stainless steel + food grade plastic + food grade silicone.

 

UPSTYLE Couple Thermos Travel Mug My Life My Love No14 Design Vacuum Cup Insulated Stainless Steel Thermos Water Bottle Coffee Thermos Vacuum Flask Size 350 ml White

UPSTYLE Couple Thermos Travel Mug My Life My Love No.14 Design Vacuum Cup Insulated Stainless Steel Thermos Water Bottle Coffee Thermos Vacuum Flask Size 350 ml, White

UPSTYLE Couple Thermos Travel Mug My Life My Love No.14 Design Vacuum Cup Insulated Stainless Steel Thermos Water Bottle Coffee Thermos Vacuum Flask Size 350 ml, White - Anti scald small tea strainer hold, can using food grade plastic material, which can avoid the lips touch with the stainless steel cup and prevent hurt. The stainless steel interior and exterior is made of high quality food grade stainless steel,after the solution of polishing, the inner surface form a protective layer, can effectively avoid coloring condensation and breed bacteria, it’s anti-corrosion and rust prevention used the vacuun-seal technology and double-wall construction,vacuum insulation for maximum temperature retention, keeping drinks hot or cold for as long as 24 hrsit’s not easy to rust,corrosion and easy to clean. The cover used food grade pp plastic and silicone gel, resistance high temperature, resistance aging, strong seal, durable used and unbreakable and upper cup used anti-skid design the lid inner made of seal silicone, can make the lid more tight and leak proof compact design takes up minimal space while maximizing capacity for effortless transport and storage, stays cool to the touch with hot liquids and is condensation-free with cold. The body surface using environmentally friendly resin paint, through the automatic point spraying technology, so that the adhesion of paint is strong, not easy to scrape off the paint matt matte cup body texture is better, feel more comfortableanti slip bottle bottom and the reinforcement bottom, make the anti-breaking performance more stronger, and the bottom used concave and convex design, make the vacuum cup steadily. Marerial made of 304 stainless steel + food grade plastic + food grade silicone.

 

DAMEI Gudetama Five More Minutes Lazy Eggs Stainless Steel Mug  350mL Coffee Thermos Vacuum Flask Water Bottle

DAMEI Gudetama Five More Minutes Lazy Eggs Stainless Steel Mug / 350mL Coffee Thermos & Vacuum Flask Water Bottle

DAMEI Gudetama Five More Minutes Lazy Eggs Stainless Steel Mug / 350mL Coffee Thermos & Vacuum Flask Water Bottle - Thermos stainless steel vacuum insulated flask travel mug beverage bottle no bpa for hot and cold. Delivery time is 7-15 days,the express is usps. Silabeled with a open and close pouring button to ensure no leaks even this. Gudetama five more minutes lazy eggs mug is 350 ml. Equipped with a one hand push button and a vertical safety lock which marked.

 

Takeya Thermo Double Wall Vacuum Insulated Stainless Steel Water Bottle 2 Pack 40 oz Blue and Silver

Takeya Thermo Double Wall Vacuum Insulated Stainless Steel Water Bottle 2 Pack 40 oz Blue and Silver

Takeya Thermo Double Wall Vacuum Insulated Stainless Steel Water Bottle 2 Pack 40 oz Blue and Silver - 18/8 stainless steel, prevents rusting. Cold for up to 24 hours 12 hours hot. Double-wall vacuum insulated stainless steel prevents outside temperature from affecting the inside and condensation from forming on the bottle. Solid loop handle makes it easy to take your favorite beverage on the go. Easy to drink spout with leak proof lid wide opening for ice cubes.

 

New Penguin Style Stainless Steel Thermos Vacuum Bottle Water Cup Travel Mug Blue

New Penguin Style Stainless Steel Thermos Vacuum Bottle Water Cup Travel Mug (Blue)

New Penguin Style Stainless Steel Thermos Vacuum Bottle Water Cup Travel Mug (Blue) - Size penguin-18671 cm. Style cartoon. Material abs+304 stainless steel. Package include 1 x cartoon thermos cup. Insolation efficiency super insolation above 12 hours.