The OnyxCool Knee provides durable cool compress support while playing the game or recovering from injury. The Phase Change Material is specially formulated to 58 F for safe, effective cool therapy. Preferred by patients over costly electrical water circulating devices. Cool charge lasts up to one hour and takes less than 30 minutes to recharge in the refrigerator or freezer. No cords or plug-in required. Additional information: Weight: 32 oz Dimensions: 14 × 10 × 2 in Materials: Veltex fabric (black); Aromatic Polyether Polyurethane; Elastic straps with Velcro closure; Hexadecane molecular formula C16H34 or CH3(CH2)14C Included: Device and two (2) straps Classification: FDA Class 1 Medical Device Product Origin: Made in the USA Safety Information: The device is not intended for use on infants. Keep and store the device away from heat and sharp objects. CANNOT be used as a hot pack. DO NOT microwave. DO NOT apply to open wounds, abrasions or a break in the skin. DO NOT over tighten elastic straps as this may affect circulation. DO NOT use bleach to clean the device. If the device is punctured or damaged, discard immediately and obtain a new, clean device. Discontinue use if discomfort, redness, increased swelling or skin irritation occurs. Wash area with mild soap and water. If pain persists, consult your physician or healthcare professional.