Treats shoulder and lower back muscles?? large heating area?? 10 inches by 18 inches weighs 2 and half pounds</br>Ideal for shoulder joint pain and lower back pain treats back and shoulder muscle groups</br>The wrap is extra long: total 58 inches long enough for a large person to tie the wrap around their bod"t stays on the shoulder or around your waist when you move around</br>The heat lasts for half an hour fleece protects the skin