Core Cooler -cooling chest panelThe Core Cooler is a cooling dog harness add-on that cools, adds additional support when lifting and assisting, and further stabilizes select Ruffwear dog packs and dog harnesses. This three-layer chest panel uses evaporative cooling to efficiently pull heat from the dog's core during warm temperatures and high intensity activities. To activate, wet the Core Cooler with water and wring out.The Core Cooler uses hook-and-loop sleeves and easily attaches to only the following Ruffwear harnesses and packs:Web Master(TM) HarnessWeb Master Pro(TM) HarnessApproach Pack(TM)Palisades Pack(TM)Singletrak Pack(TM)ADDITIONAL FEATURESProvides load dispersion and stabilityMade in VietnamWASHING INSTRUCTIONSSecure fastenersHand washMild detergentAir drySizingSIZING CHART & TECHNICAL SPECSMeasurement is around the widest part of the rib cage. Use the sizing chart to select the appropriate size for your dog. In between sizes: Choose the larger size. The size should match your existing compatible Ruffwear harness or pack.GirthSize17 - 22 in (43 - 56 cm)XS22 - 27 in (56 - 69 cm)S27 - 32 in (69 - 81 cm)M32 - 42 in (81 - 107 cm)L/XL