FlexiKold cold packs are not only more flexible than competitors, but they stay colder for a longer period of time too. Why? It’s the Gel. Unlike the bentonite ingredient used in competing cold packs, FlexiKold is powered by a proprietary gel interior that remains pliable when frozen. And because the gel stays colder for a longer period of time, less gel is needed. And that allows us to construct a thinner, more user-friendly product. The result is, a colder, thinner, and more flexible cold pack that provides superior contact with the treated area and easily conforms to any part of your body. Constructed of extra-thick flexible nylon material, FlexiKold offers a professionally double sealed gel pack, that prevents leaking, with a smooth high-quality feel.4 SIZES: Standard Large, Oversize, Half size, & Neck Contour cold pack.