• Cold Application: The reusable Comfytemp cold gel packs offer cold therapy to relieve local pain and reduce inflammation. Freeze for at least 1 hour and apply for about 30 minutes. • Heat Use: Heat the gel pack in hot water at 80°C for 5 minutes or in the microwave for 40 seconds. Apply for about 30 minutes to stimulate circulation and relieve muscle and menstrual pain. • Extra Large Size: Measuring 27 cm x 37 cm, these gel packs are larger than conventional ones, allowing for better care of the back and abdomen. Filled with more gel and with dividing lines for even distribution. • Flexible: The professional gel does not freeze at -18°C and remains flexible after 1-2 hours, allowing for optimal adjustment to affected areas. Includes adjustable elastic bands for better fixation. • Natural and Durable: Made with colorless, odorless, and non-toxic gel, these packs provide safe and natural relief for muscle pain, arthritis, and inflammation. The surface is made of high-quality spun nylon for greater comfort and durability. • Easy to Clean: Can be easily cleaned with water and soap when dirty. • Material: Durable nylon and vinyl fabric. • Includes: 1 pack and 1 adjustable strap.