<p>Brew and sip your favorite loose or bagged tea in our double-wall mug. The two seamless walls of borosilicate glass create an insulating layer of air, so tea stays piping hot – yet the cup always feels cool to the touch. The lid prevents evaporation as the tea seeps and steams.</p> <ul> <li>Expertly crafted of mouth-blown glass.</li> <li>Lift-out tea strainer works with loose and bagged leaves.</li> <li>Glass remains cool to the touch with hot drinks and will not "sweat" with cold drinks.</li> <li>Glass will not become cloudy over time.</li> <li>Commercial Grade: Thoughtfully designed and expertly engineered to meet rigorous standards and best practices from select commercial testing.</li> </ul>