The Isolator Cup contains fins that reduce the heat on the outside and keep your hands cool. No need to burn your hands on a hot drink. The design is inspired by the shape of an engine’s heat sink. Due to the shape of the narrow fins, less heat will transfer to the outside. A matching saucer and silicone lid are optional additions to make it your favorite cup for daily use and on the go. Available colors: Ceramic Saucer: Blue, Coral, White, Green Silicone Lid: White Note that these are only the accessories. Looking for the Isolator Cups?