Keeping your pooch cool on the trail. Overview An add-on for Ruffwear harnesses and packs, the Ruffwear Swamp Cooler Core uses evaporative cooling to efficiently pull heat from the dog's core, while adding support when lifting and assisting dogs. The recent model has an updated external air mesh for improved abrasion resistance and improved water absorption. Features Key Features Three-layer construction cools the core Wicking outer layer reflects heat and facilitates evaporation Absorbent middle layer stores water for evaporation Mesh lining keeps the dog dry and comfortable Provides load dispersion and stability Hook-and-loop sleeves for easy on/off Compatible with Ruffwear's Web Master™ Harness, Web Master Pro™ Harness, Approach™ Pack, Palisades™ Pack, and Singletrak™ Pack Technical Specs Outer Layer: Polyester air mesh (bluesign® approved) Middle Layer: Polyester non-woven Lining: Dry-weave polyester mesh (bluesign® approved) Closure: Hook and loop Sizing Note that the sizing of harnesses are not common across the dog harness range. Please check sizing and measurements carefully. *Measurement around widest part of rib cage Size Girth XS 43-56 cm (17-22 in) S 56-69 cm (22-27 in) M 69-81 cm (27-32 in) L/XL 81-107 cm (32-42 in) Care Hand wash Mild detergent Air dry