Sammons Preston Cold Packs are constructed with highly durable polyurethane material that allows for it to have a longer shelf life and also helps it resist bursting. Unlike normal ice packs that can burst after a few uses, these cold packs can be used hundreds of times while still holding their temperature (for up to 30 minutes). The polyurethane material also permits the cold pack to be flexible, letting you conform it to your body. Features Provides cooling pain relief for up to 30 minutes when frozen, delivering long lasting cold therapy for aiding in muscle recovery, rehabilitation, and swelling reduction. Even when frozen, the pack remains flexible to allow for complete contact to the desired area for maximum effect. Constructed with extra durable polyurethane materials that help prevent the cold pack from bursting and have a longer shelf life. The polyurethane material used is latex-free and easily wiped clean for sanitation to prevent cross-contamination and shared use. Options available SAMPA955015 - Standard | 10 in x 13 1/2 in SAMPA955016 - Neck Contour | 21 in L SAMPA955017 - Oversized | 12 1/2 in x 18 1/2 in