Premium Stainless Steel : Made of food grade 18/8 stainless steel that is 100% BPA free and non toxic, this water bottle is fully resistant to oxidation and rust , never leave a metal taste which is more durable and lasting. Inner Steel, Outer Plastic with Polyurethane Foam insulation layer in between for storing cold beverages. | Leak Proof: Bottle wide lid sealed by silicone circle BPA free, completely leak proof when it's laid on its side or even shaken | Flavor Retention: Food-grade stainless steel body with BPA free lid, which guarantees no flavor transfer which ruins the original flavor of your beverage or water, just enjoy it | Environment Friendly & Easy To Clean - It is simple using and easy to clean, the Inner Steel Outer Plastic with PU Insulation Water Bottle is BPA Free and nontoxic, and it is also easy to clean | Suitable for all outdoor sports: hiking, camping, fishing, boating, yoga or gym fitness. Meanwhile, it's good companion for office, party or festivals to share drink with families and friends in the best temperature