100% Cotton Imported TempShield insulation keeps beverages cold up to 24 hours and hot up to 12 hours Made with 18/8 pro-grade stainless steel to ensure durability, pure taste and no flavor transfer Flex Cap is leakproof when closed, to transport without worry Flex Strap is easy to transport and comfortable to carry Honeycomb Insulated cap for maximum temperature retention Color Last powder coat is dishwasher safe, keeping your bottle slip-free and colorful Fits most backcountry water filters BPA-Free & Toxin-Free