Sea to Summit's X-Bowl, X-Plate, X-Mug and X-Cup hold warm or cold liquids and are freestanding with flexible silicone sides. The X-Mug and X-Cup have a flat rigid ring around the rim to keep them sturdy and easy to drink from. The rigid ring maintains the shape of the product yet still allows it to be collapsed to a disk that will fit in the palm of your hand! The X-Bowl and X-Plate have a hard nylon scratch-resistant base for cutting and chopping.All three flatten to the same 15 mm profile and nest inside each other - the X-Cup inside the X-Mug which fits inside the X-Bowl which nests inside the X-Plate. The sides are made from food-grade flexible silicone that can withstand temperatures of hot foods and nearby hot surfaces. All three are manufactured from FDA and EU compliant materials.