Elasto-Gel Hot/Cold Pack. Made utilizing a tough, flexible, high-glycerin gel that is covered with a four-way stretch material that allows maximum conformity, hot and cold transfer, and comfort. Remains flexible, even at a -20 F. Microwaveable. Will not leak if punctured. Will not dry out. Durable, comfortable and easy to use. Latex-free. 12? x 12?