flexikold gel ice pack (standard large: 10.5" x 14.5") - two reusable cold therapy packs (for pain and injuries to knee, shoulder, foot, back, ankle, neck, hip, wrist) - 6300-cold by natracure natracure two (2) pack. flexikold gel 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.