With anti-bacterial fiber! For injury prevention and recovery. Hot & cold therapy wraps are used for temporary relief of minor muscle and joint pain, swelling, sprains and strains, stiffness, and muscle spasms. May be used in place of hot water bottle or heating pad. Used by physicians, trainers and world class athletes! A great alternative to ice cubes, bandages and hot water bottles! Up to 35 minutes of continual hot or cold therapy. Reduces pain, stimulates circulation and expedites healing. Microwave or freeze. Adjustable contour fit. Reusable & non-toxic. Machine washable. Breathable sleeve. Flexible when frozen. Ideal for: Shoulder; elbow; wrist; hand; calf; shin; knee; neck; back; foot/ankle; headache - sinus/migraine. Works both hot and cold!