The Hydro Flask Standard Mouth 21oz bottle makes staying hydrated easier than ever. This water bottle in stylish Cobalt uses lead-free TempShield™ technology to keep your beverage at the perfect temperature. The double wall vacuum insulation prevents condensation and heat transfer—keeping cold drinks icy cool and hot ones piping hot for hours. The 18/8 pro-grade stainless steel construction is durable, long-lasting, and provides pure taste with every sip while the proprietary powder coat finish ensures slip-free grip. With a convenient loop on the Standard Flex Cap lid, this bottle is easy to carry and great for those on the go, whether camping, hiking, at the gym or just soaking up the sun.