Lifecraft tumblers are durable and engineered to retain the temperature of your drink. We use double-walled vacuum insulation technology. The space between the stainless steel walls are void. With no medium to transfer the heat, the liquid inside isn't affected by the temperature outside the tumbler. Our tumblers are made of food grade 18/8 stainless steel. Our lids are BPA - free, with an auto sealing gasket that seals the drink in the cup. The tops have a sliding lid that can accommodate a straw. 
The cups will keep your hot coffee, and tea hot for up to 8 hours and your ice cold water, pop or beer cold for up to 24 hours. Hot liquids won't impact the cups exterior, and there will never be condensation, keeping your hands dry. Your mug will always be comfortable to hold and you'll never need another coaster.  The tumblers were designed to fit into any standard sized vehicle cup holder. Whether you’re hanging at the campsite, hiking up a mountain trail or fishing at the lake house, the temperature of your drink will be better protected with our USA flag and fish tumbler. Makes a great fishing or camp gift for family and friends. Not recommended for dishwasher.