TempShield️ double-wall vacuum insulation keeps drinks cold up to 24 hours, hot up to 12 Flex Cap is leakproof when closed Honeycomb️ Insulated Cap for maximum temperature retention Made with 18/8 pro-grade stainless steel for durability, pure taste and no flavor transfer Color Last powder coat is durable, sweat-free and colorful. Stainless steel insulated refillable reusable-our wide-mouth water bottle is the flask to grab to keep cold drinks cold and hot ones hot. The large mouth allows for easy filling and cleaning.