A high quality drinking mug that is specifically made for the person who loves to take a liquid refreshment along on all of their outdoor adventures - it's a smooth design for a rough ride! It does everything you want in an outdoor drinking mug! It forms and holds tight in any cup holder, won't spill or leak, can be opened, closed & locked with one hand, and keeps all outside dirt and debris away from you mouth. And of course, it keeps your favorite drinks cold or hot for hours and hours. There's nothing else that can do all this. Do not fill with overly hot or boiling liquid - Can create internal pressure. Mower not included.