These specially designed products are ideal to help restore flexibility and provides excellent therapy for minor injuries during and after rehabilitation exercises. It will not burst or leak, so it is better able to handle activities and wear and tear better than traditional hot or cold gel packs.Elasto-Gel Hot/Cold Therapy Wraps may be used for hot/cold therapy. Elasto-Gel products may be heated in a conventional or microwave oven, crock pot, or Hydrocollator, and cooled or stored in a refrigerator or freezer. The gel can be heated or autoclaved at temperatures up to 250 degrees Fahrenheit, or freezed at temperatures as low as -20 degrees. The wrap will remain cool for 20 to 40 minutes, and will provide heat for 20 to 30 minutes.