Grabber's Peel N' Stick Body Warmer is "the portable heating pad you can wear"! It provides soothing comfort for minor aches and pains, as well as extended everyday warmth during outdoor sporting activities. Simply stick your Adhesive Body Warmer to an inner layer of clothing to enjoy over 12 hours of heat. All Grabber Warmers are designed for one-time, disposable use. Individual Warmer Specs:- Size 4" x 5"- Avg Temp 127 F/53 C- Max Temp 154 F/68 C- Duration 12+ HoursMinimum 1x box order. 40 warmers per box. Don't go for the cheap substitutes which are known to split and not last as long as promised.