Product description Click to Activate, No Microwave or Boiling Water Needed Our gel packs are composed of water and sodium acetate (vinegar and baking soda). The durable outer casing is BPA-free and latex-free. When the internal disc is clicked, a reaction is set off, causing the liquid inside to immediately crystallize and heat up to approximately 130℉ (54℃) in seconds. Just click the coin disc for instant heat or refrigerate for a cold pack. No electricity or microwave required Non-toxic Long-lasting heating pad Safer than electric heating pads Reusable over and over again Instant Activation Simply click the metal disc and you’ll have a soothing hot pack in seconds. This snap heat pad will provide longer lasting heating time ( about 20 to 30 minutes). Time varies depending on room temperature. To prolong the heating effectiveness, just wrap it up in a thin towel, cover under a blanket, or place under some clothes to reduce heat released away from the body. Hands-free Design Pocket with elastic strap allows the gel pack to be held in place during daily activities. Note: If packs arrive stiff and hard – they are not defective, but were likely activated during shipment. Place them in boiling water for 5 – 10 mins or until the gel is clear. Allow to cool and they are now ready to be snap-activated. Pad is NOT microwavable. There is a metal disc inside the pack that could cause damage if placed inside a microwave. The pack will be quite solid after hot therapy. To return the pack back to its liquid state, simply boil for 5-10 mins or until gel is clear. Safe & Non-toxic Material Our reusable hot cold pack contains sodium acetate & water and has a non-toxic and latex-free PVC casing. Safe for all ages. Easy to re-use Boil the packs for around 5-10 min or until all crystals dissolved and the gel is clear again, let it cool to room temperature and it is ready to be activated again. If you don't see all the crystals completely boiled out, just add a minute or two as needed. Cold Treatment Place the gel pack in the refrigerator for 1-2 hours at its liquid state before applying cold therapy. The pack can remain in the refrigerator for an unlimited length of time without causing any damage. Note: DO NOT place packs in the freezer. Click Activated Neck Heating Pad Click Activated Heating Pack Heated Eye Mask Moist Heat Pad Stem Heat Eye Warm Eye Mask Disposable Buying Options Buying Options Buying Options Buying Options Buying Options Customer Reviews 4 1 50 21 42 Material Sodium acetate (vinegar and baking soda) & water Sodium acetate (vinegar and baking soda) & water Silicone Beads Silicone Beads Power and medical non-woven fabric Features Click Activated, Reusable Click Activated, Reusable Microwavable, Reusable, Moist Heat Therapy Microwavable, Reusable, Moist Heat Therapy Air Activated-convenient, Portable, Disposable, Moist Heat Therapy