Instant re-usable heat packs that you simply click the metal disc and a chain reaction takes place producing heat! Excellent for muscular pain, outdoor activities, aches and pains, poor circulation and sports injuries. Styles will be chosen at random unless specified at checkout. Instructions:- To activate the heat pack, press and pop the small disc, the heat pack will crystalise and generate heat. To re-use Put the hardened heat pack into boiling water and boil for approximately 5-10 minutes until all the crystals have dissolved and gone soft again. Once the pack has fully cooled down, you make take with you to re-activate any time. 11.5cm wide x 8cm long x 6mm thickSexy hot pants designReusable heat pack / hand warmerTwo hot pants styles, please add a note at the checkout if you have a preferenceNot actual pants