Come and Check Our Promo Solutions.This 20oz tumbler is with Double-Wall vacuum technology to keep drinks hot for over 6 hours and cold for around 24 hours. Made of high quality 18/8 304 food-grade stainless steel. Rust-proof, easy wash, and unbreakable. The Eco-friendly sliding lid is easy to provide maximum splash-proof. Pls check inventory and detailed info with us before placing your orders.