Sun’s Tea (TM) glass is sturdy and durable, designed for everyday use. The double wall structure keeps your hot drink hot and cold drinks cold for a long time. Its two wall structure allows you to hold onto a piping extreme hot glass of hot drinks without burning your fingers, or prevent condensation from forming on the outer wall while holding a cold beverage. This double wall glasses is made of ultra clear laboratory rate stronger borosilicate glass. Not like other fragile double wall glasses which is so easy to be broken, this one is very solid and durable, it is perfect for your everyday use. The screw-on cap effectively prevent spill when you move around with a full glass of drink. It is perfect to use in the office, at home or in a car. * Sun’s Tea(TM) is the trade maker owned by SUN Valley Enterprises LLC