Ruffwear - Swamp Cooler, Cooling Vest for Dogs Maximum cooling through evaporation and heat reflection^Three-layer construction maximizes cooling effects: wicking outer layer facilitates evaporation absorbent middle layer stores water for evaporation comfortable inner layer transfers cooling effect to the dog^Active fit for full range of motion^Side-release buckles for easy on/off^Fits dog girth 17 - 22 inch