The innovative Thermo Trivet is made of durable high-quality material and used to keep vessels of food and beverage warm. Thermo Trivets may be used both indoor and outdoor. Heat the Trivet in a 400°F oven until warm to the touch. The micro-quartz sand filling inside the neutral green Kevlar fabric retains heat for about one hour. The Teflon bottom protects tabletop surfaces from heat damage. For use with vessels of any material. Follow instructions included with trivets. NOT to be used in the microwave.