Contigo AUTOSEAL Sheridan Double Wall Insulated Travel Mug, 16-Ounce, Greyed Jade Patented AUTOSEAL lid automatically seals between sips to protect against spills and leaks Simply press the button to sip and release the button to seal the mug Double-wall insulated mug construction retains temperature and prevents sweating Made out of 100% BPA-free plastic Lock feature prevents accidental button actuation when carrying inside bags or with other items