Package Component 1 X Warmer Kneepad Product Details It acts as a cushion to protect your knee, retains heat and makes your knee cap area very comfortable. It is beneficial for anyone who has knee pain, arthritis, or someone who needs special knee protection. Non-allergenic for most people (dermatologists tested); Adjustable & High tensile strength and elasticity. Reusable & durable (saves in the long run); Washable (hand wash and hang to dry); Easy to Carry, you can use anytime and anywhere. Velcro Self-adhesive. Easy to wear, you can adjust the tightness. How to use: Rub with water, and close to the skin, you will feel hot after 30 minutes. Generally using twice a day, one time for about 3 hours. The length of wearing time depends on individual physical state. It is not suitable to wear when sleep. Size: Approx 43cm Maximum Knee cap circumference X 25.5cm height Material: Bamboo charcoal powder, Nano-materials, Magnet