Double Wall Tumbler

The cup is designed with unique anti-twist and leak-proof design. Cup with unique anti-twist anti-leakage design, no cover silicone film twist pipette cup. A 12-ounce double-walled thermos, suitable for children, students, and office workers, no longer worry about knocking down your water glass. FREEZER SAFE: This mug can be it could also be used in the freezer if you are trying to cool your drink down. SIMPLE TO USE: The mug is really easy to use simply twist the top membrane around and watch as a seal is quickly formed over the top of the mug. KEEPS IT HOT OR COLD: Each mug is can hold up to 12 oz and is double walled! Keeping drinks hot for 2 hours and keeping drinks cold for up to 6 hours. TWIST TOP LIDLESS DESIGN: Using a silicone membrane and a revolutionary design there is no lid to this new mug. Instead, you simply twist the silicone membrane over the top of the mug and watch as the seal is formed. LEAK PROOF & EVEN HOLDS A STRAW IN PLACE: The silicone membrane is ad