flexikold gel cold pack (oversize: 13" x 21.5") - ice compress, therapy for pain and injuries of shoulder, back - a6302-cold - (x-large) by natracure natracure 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.