The Stainless Mug features an ultra-lightweight design for added portability. The tight fitted flip-open lid with a safety lock makes drinking from the mug easy and prevents beverages from spilling. Stainless steel vacuum insulation keeps beverages hot or cold for hours 2-step lid release process prevents excess condensation on the stopper from being flung off while the lid opens Safety lock to prevent the lid from opening accidentally Stain & odour resistant nonstick coated interior A special manufacturing technique was used to make the body ultra-lightweight and compact 1-5/8” wide mouth opening accommodates full-sized ice cubes Made of BPA-free plastic and stainless steel