Our Triton hard plastic tumbler lid is lightweight and durable, with an angled lip for a comfortable feel while drinking and less chance of heat stings from hot liquids. The sliding cap keeps your drink secure as you drive and walk around town. Choose this for day hikes, days out of the office, or any time. Fits both 16oz. and 12oz. tumbler sizes. Care and washing: sliding cap disassembles from base of lid for easy washing.