QUALITY VERSATILE COLD THERAPY PACK - WORLD-BIO gel pack for injuries help with post-surgery recovery, muscle pain release, chronic shoulder discomfort, SI joint issues. Within seconds, chills anywhere to relieve soreness, bruises, pain from injury, inflammation, or chronic conditions. Medical grade ice pack also a first-aid essential for home or clinical use as it is ideal for sports injuries, strain & stiffness, swelling, body aches and more. FLEXIBLE & SAFE & LEAK PROOF - Outer nylon gel bag of back cold pack made of durable premium material that is gentle on the skin, and pressure sealed and not leak over time. Cold Pack keeps flexible and soft even frozen at 0°F (-18?) and stay cold or warm longer with the soft fabric wrap or a towel. BEST CHOICE OF HOT AND COLD COMPRESS TREATMENT - Whether it's a swollen ankle, back pain or muscle cramping, cooling pack is safe be heated in the microwave or boiled water to help relax sore muscles and promote increased blood flow or chilled in a freezer to help reduce swelling and blood flow all while promoting healing. ALL-IN-ONE LARGE ICE PACK FOR INJURIES, SPRAINS, MUSCLE & JOINT PAIN - Medical-grade gel pack brings natural relief to knee replacement, shoulder/ hip post-surgery, baseball workout recovery and hot flashes during the night. LARGE REUSABLE ICE PACK & STAYS COLD LONGER - Professional ice pack measures 11.5" x 15.4", great size gives good area coverage to the back, knees, calves, shins and shoulders. Hot and cold pack contains much more gel inside to provide much longer hot or cold therapy time, 2 physical therapy ice packs in all.