They can't give you a hug when you're feeling crampy, but our heating patches come close. From minor menstrual pains to supersized soreness, our regular (2.7 x 3.7 in) and XL (2.9 x 6.7 in) heating patches instantly warm up to an ideal, therapeutic temperature to promote blood flow and help your muscles relax for maximum relief. Application Tip: Apply patch on undergarments around common cramp zones. Do not place directly on skin. Ingredients: Iron, Activated Charcoal, Vermiculite, Sodium Chloride, Polyacrylic Acid, Sodium Salt, Water (Aqua), Rose Flower Oil, Citrus Limon (Lemon) Peel Oil, Jasminum Officinale Flower Oil.