18/8 STAINLESS STEEL – Made with kitchen-grade stainless steel, so they’re puncture and rust-resistant. DOUBLE-WALL VACUUM INSULATION – Keeps cold drinks cold and hot drinks hot until the last sip. DISHWASHER SAFE – Because no one needs more work to do. LEAK-RESISTANT LID - Twist-on, twist-off lid backed with dual-slider magnet technology to keep your coffee full and worries away. (As long as it’s closed.) YES – All YETI Drinkware is BPA-free.