2pcs Wormwood Self-heating Knee Pads Knee Brace Leg Warmer ---✔HIGH QUALITY MATERIAL:Wormwood Knee Sleeves Made of high quality materials and is safe and comfortable to wear, breathable, very suitable for pain relief. ---✔ SELF HEATING KNEE PADS: Magnetic field therapy provides natural warmth to the knee area which relieves pain by relaxing muscles and provides you with the much-needed comfort. Help improve blood circulation, swelling, suitable for people with frost. ---✔ RELIEF OF KNEE PAIN - It can also stimulate blood circulation and improve blood circulation, warm the knees and can also be used on calves, thighs to relieve muscle soreness and cramps.