Sea to Summit Delta InsulMug:Closed-cell polyurethane skin ups the thermal insulation to keep your drink warm for long periods of time; also enables you to hold the mug without burning your handsDishwasher-safe nylon construction is 100 percent BPA freeRim of mug stays cool so you can comfortably sip a hot beverageHandleless design allows mug to stow away easily inside a packFeatures a sip-through lid and a hang loop