Two Application Modes: Ice Mode: Rapid cooling, relief from sprains, swelling and sports injuries Heat Mode: Relieves pain, improves arthritis, dysmenorrhea and muscle fatigue Efficient Relief: Made of high-quality materials, the ice pack can quickly cool or heat to relieve muscle pain, sprains and arthritis. Note: Do not use boiling water for hot compresses, and the temperature is 50-60C/122-140F. Comfortable Fit: The 23cm size is suitable for both men and women, and can relieve pressure on shoulders, waist, back, etc., and relieve headaches, stomach aches and joint pain. A strap is included to secure the ice pack, allowing you to precisely relieve the pain. Easy to Carry: The ice pack is small and lightweight, easy to carry and can be used anytime and anywhere - perfect for travel, outdoor activities, etc.