AeroLight Highlights 18/8 stainless steel, BPA-free AeroLight™ spun-steel, double-wall vacuum insulation Leakproof Locking, drink-through lid Car cup holder compatible (Base diameter : 2.8 inches) Dishwasher safe 8 hours hot 12 hours cold 40 hours iced Engineered for your commute, this low-profile bottle is one-third lighter than our standard stainless steel bottles. The secret is Stanley’s AeroLight™ featherweight technology that doesn’t compromise on durability or thermal performance. Your water will stay cold from the time you leave home until well after quitting time. The drink-through lid locks tight for leakproof carrying in your bag or pack.