Ruffwear's Jet Stream Dog Cooling Vest is the ideal addition to summer expeditions! Helping to efficiently cool down your hot dog, the vest is lightweight to let them run and wriggle as much as they want whilst staying chilled through evaporative cooling. To use, simply douse in cold water, wring out, and put it on. The three layer construction helps maximise cooling; first the wicking outer layer reflects heat away from your hound and facilitates evaporation, the absorbent middle layer stores the water needed for evaporation, and finally the comfy inner layer transfers all the cooling effects to your dog. Read more…Size Guide - Girth around the widest part of your dog's rib cageLarge / Extra Large: 81 - 106cmMedium: 68 - 81cmSmall: 56 - 68cmExtra Small: 43 - 56cmExtra Extra Small: 33 - 43cmPlease Note** Should you need to return this item, please ensure that it is in the condition it arrived complete with tags and original packaging to be eligible for a full and immediate refund/exchange. Washing Instructions: Secure the fasteners and wash in a cold water on a gentle cycle using mild detergent, then allow to hang dry. Do not bleach, iron or dry clean.