The Alinelly Stainless Steel Tumbler is made with double wall vacuum insulated. It allows you to enjoy your favorite drinks, hot or cold, for many hours. The leak-proof lid design prevents drinks from spilling and is BPA free. The spout vent hole allows drinks to flow smoothly, without splashing or overflowing. The sipper hole allows you to drink directly or with a straw. The exterior of the tumbler is powder coated with a matte finish, providing a comfortable tactile sensation. No matter where you go, it is the perfect companion during your travel and daily use.