Made specifically to fit the Children's Cool Vest, the Spare Children’s GlacierPack set can help ensure continuous cooling for children. When the GlacierPack set included with the vest needs recharging, simply remove and replace with the Spare Children's GlacierPack set. New in June 2020: The sets now consist of four packs with three compartments each. The new packs feature horizontal cells that conform to the torso as your child bends and stretches. For maximum cooling, insert two packs in each inside pocket of the vest. For less demanding conditions, such as indoor use, you may lighten the vest by using a single pack in each pocket. Also included: Amesh bag that makes it easy to transport, recharge and store the packs.