RB-1843 Far-infrared (According to the survey)Far-infrared, is a wavelength of light. Measured by scholars and experts can be divided into 0.76-4mm the near infrared. After a number of clinical trials in Japan, MD, and human biochemistry far infrared wavelengths 8-12mm close. Easy to resonate with the human body and skin marrow 2-4 cm deep, with warm, massage, promote blood circulation, activate cells and other functions, is essential to the flora and fauna of light.Product Feature:- Perfect for people with activity related knee pain and knee injuries as well as for people with chronic pain of arthritis- Support to warm up strained muscles and tendons in the knee area and relieve pain, soreness, tightness and discomfort.- Improved blood flow- Enhanced injury healing- Reduction in pain, aches, soreness and inflammation Made in Taiwan Available Size:- S: 28.0 ~ 34.8 cm- M: 30.5 ~ 38.1 cm- L: 33.0 ~ 41.4 cm- XL: 38.1 ~ 47.5 cm