The pad helps the user to be free of back pain as well as neck pain. It also helps to get relief from sore and aching muscles, and to generally relieve tension from the body. The comfortable heat of the pad that is evenly distributed everywhere helps to achieve this. ALL Size Extra large or XL size: Shoulder width of about 50CM, suitable for weight between 150-190 pounds Large or L size: Shoulder width 45CM-48CM, suitable for weight 130-150 pounds Medium or M size: Shoulder width 40CM-44CM, suitable for weight 110-130 pounds Small size or S size: Shoulder width 40CM, suitable for weight 90-110 pounds High QualityWith comfort slightly stretchable neoprene & nylon fabric that gives you support while allows air circulation, and self-sticking band at sleeve for size adjustment. This should support is breathable, absorbent, skin-friendly and flexible, great for long time wearing. Strengthened warmthThis therapy thermal self-heating shoulder support includes four heating pads on shoulders (two per side) and one widened heating pad at the back, just right to provide mighty warmth to help your shoulders recovering. Pain ReliefCommonly used by people suffering from frozen shoulder, sprains, strains, torn rotator cuff, bursitis, shoulder muscle soreness, tendonitits, stiff joints, dislocated AC joint, AC separation, and more Additional BenefitsImprove human microcirculation, accelerate metabolism, and quickly eliminate fatigue. Help burning excess body fat can achieve certain weight loss goals. Wear daily to gain extra warmth on extremely cold winter days, giving your should a toasty embrace. Wonderful gift ideal for dad, mom, wife, husband or adult friend.