FlexiKold Gel Ice Pack (Standard Large: 26.5 cm X 36.8 cm) Ice Pack for Injuries, Reusable Cold Pack for Back Pain Relief, Migraine Relief Pad, After Surgery Comfort, Postpartum essentials, Headache, Shoulder, Ankle, Neck, Hip - 6300-COLD by NatraCureColder For Longer: Reusable ice packs for injuries with proprietary gel interior that stays Colder for Longer than competing cold packs using inferior clay or bentonite formulations. More Flexible: The Most Flexible Cold Pack available due to the best professional grade gel interior that remains pliable when frozen. Helps knees, back, shoulders, hip, neck or anywhere it hurts. Healthcare Professional's Choice: Used by thousands of physical therapists