The Hydro Flask 20 oz Wide Mouth is a double-walled thermal bottle with TempShieldTM vacuum insulation. It keeps your tea or coffee hot up to 6 hours and cold beverages icy for up to 24. The bottle is crafted with a rugged, durable construction ready for any outdoor expedition. It is made of durable 18/8 Pro-Grade Stainless Steel construction and is BPA-Free and Phalate-Free. The durable, sweat-free powder coat finish adds a better grip and more durability.