Up to 16 hours of pain relief for back and hip, with ThermaCare technology. Patented Heat Cells with deep penetrating therapeutic heat accelerate healing. Discreet, odourless, and thin, these warming wraps can be used under clothing and costumes without any added bulk. Box of 6 Single-use heatwraps. Stretch fit wraps fit the following pant/waist sizes: women's size 4-20, men's waist 28" to 47".