The Transition tumbler is designed for outdoor enthusiasts! The double insulation keeps beverages hot or cold for hours, and the sliding closure lid helps prevent spills. With 20 ounces of stainless steel construction and a silicone bottom, it keeps your drinks secure and the tumbler noise-free. Stainless steel straw is included. Silicone tips are available for purchase. This tumbler is perfect for the fishing and hunting hobbyist!