Durable, reusable mug with advanced hot/cold temperature retention. great for keeping beverages extra frosty. Flip ‘n’ Sip lid features a mouth opening cover that opens easily & clips securely into place when open or closed. The lid is leakproof when the Flip ‘n’ Sip mouth cover is closed Dual-threaded lid and handle design supports both left- and right-handed drinking. Includes a gasketed, leak-resistant straw for effortless, comfortable sipping; straw separates into two pieces for easy cleaning & storing Double-wall, vacuum-insulated design with a copper lining enhances temperature retention. Food Grade 304 Stainless Steel: BPA Free. Dishwasher Safe Sweatproof exterior (no condensation!) so tumbler isn’t slippery and hands stay dry, plus a built-in rubber coaster on bottom.