These 100% stainless steel bottles were built to last and magically keep your beverages either hot or cold for hours. Whether you are shredding the trail or battling the morning commute these bottles will be your new BFF making sure you stay hydrated, caffeinated and happy! These bottles are made with18/8 Medical Grade Stainless Steel and keep liquids cold for 24 hrs& hot for up to 12 hrs. Because they are vacuum sealed these donot sweat.