The insulated water bottle is made with 316 stainless steel inside and 201 stainless steel outside. 33 oz large capacity is designed with a two-stage independent tea compartment, one touch lock and self-contained cup. Nearly 12 to 24 hours of long-lasting temperature lock, vacuum insulation and keep cold, so that every moment of the temperature can be locked in the cup.You can fill it with tea, coffee, and favorite drinks.