Features: Brand new and high quality Self-heating pad designed for the knee. High elastic belt, good elastic, wear comfortable, paste and firm, changeless form. Can effectively improve blood circulation, promote metabolism, and clear the meridians, enhance immunity. To promote the new supersedes the old. The body, regulate the nervous system, endocrine activation. Analgesia Quhan, dilation of blood vessels. Alleviate the physical local fatigue and pain. Have anti-inflammatory and analgesic, swelling the role. Easy to use, discreet and can be used anywhere any time. Safe & comfortable to wear. Description: Color: Gray, Black, Skin SizeOne size fits most people, whose weight between 40-90kg. Material: Dacron Wormwood Package includes 1Pair(2 PCS) x Therapy Knee Notes: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you