Specifications: Self-heating pad designed for the knee. High elastic belt, good elastic, comfortable, paste and firm, immutable shape. It can effectively improve blood circulation. Easy to use and can be used anywhere at any time. Item Name: Knee Sleeve Material: Nylon + Latex Quantity: 2Pcs/Set Features: Thermal, Comfortable, Elastic Size Details: S: Length: 28cm/11.02", Upper Width: 16cm/6.3", Under Width: 14cm/5.51", Suitable Leg Circumference: 30cm - 35cm/11.81" - 13.78" (Approx.) M: Length: 28cm/11.02", Upper Width: 17cm/6.69", Under Width: 15cm/5.91", Suitable Leg Circumference: 35cm - 41cm/13.78" - 16.14" (Approx.) L: Length: 28cm/11.02", Upper Width: 18cm/7.09", Under Width: 16cm/6.3", Suitable Leg Circumference: 41cm - 47cm/16.14" - 16.54" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 2 x Knee Sleeve