Tired of using uncomfortable old ice/hot bags? We've got your solution our hot & cold gel pack is specially designed to fulfill your needs in an easy, soft and comfortable way ideal for cramped and knotted muscles, or any kind of physical pain heat therapy is recommended by physical therapists. Stop living in pain relief with the LotFancy hot/cold gel-packs is guaranteed as you can apply either cryotherapy or thermotherapy (cold or warm) to reduce the pain and apply the right healing therapy. Why is it so comfortable? What makes it so special? Well, this gel is dense, which allows it to hold its temperature for a long time, and also flexible, and soft so it conforms to the body area being treated. Usage for cold treatment place the gel-pack in a freezer for at least 2 to 3 hours. Unlike other cold-packs, this gel-pack won't become rigid under ordinary freezer temperatures. Usage for warm treatment a microwave oven can be used. Microwave: Start out by heating for 20-second intervals until the pack reaches the desired temperature. After removing from the microwave, knead and flex the gel-pack to even out the heat. Caution: Be sure to cover the bag with a towel or a covering until you get the desired temperature, people with nerve damage in the area being treated should consult a doctor. Body friendly: These packs use nontoxic sodium carboxymethyl cellulose (cmc) and glycerin to store up either heat or cold. Package include: 6 x hot & cold gel packs LotFancy will provide you with a 1-year warranty .