This pair of Side Cooling Packs include 1000 denier Cordura nylon pockets that each hold a TechKewl Cool Pax also found in our TechKewl Vests and Cooling Pad. The Phase Change Material used in the Cool Pax inserts is non-toxic, non-flammable, durable, reusable, lighter than water and releases long-lasting cooling relief for your dog. Additional or replacement Cool Pax are available. The side packs attach to any of our modular harness system harnesses that include three G-hook loops via 1" mil spec nylon webbing straps on each side ending with G-hooks. They connect under the belly by two adjustable nylon straps using high-strength quick-release plastic buckles. Available in Coyote, with other colors available upon special request.