Fastaid Advanced Heat Pad is able to provide deep, comforting warmth to areas of discomfort for up to 8 hours. The special pad warms the area it is applied to & is held in place by a hypoallergenic adhesive. The pad is flexible & safe for discreet application directly to the skin. It can also be applied to under garments to help provide reassuring, soothing warmth. The pads are discreet, odourless, drug free, flexible & long lasting.