Size L/XL – Experience on-the-go massage and with heat. Choose from 5 different vibration massage speeds and 3 intensity programs to find your perfect comfort level. The belt features an air compression massage plus heat, which can warm up to 60 degrees, providing deep, soothing warmth to your back. Featuring a rechargeable battery that lasts up to 5 hours and recharges fully in just 2 hours, this belt is perfect after a long day at work or take with you on-the-go.