Lightweight Cooling Dog Vest - Evaporative Cooling for Hot Weather —> Gently used, washed as instructed (listed at bottom) -Size is based on your dog's girth (measurement around the widest part of the rib cage). This is a size Medium: 27-32 in (69-81 cm). FYI - **These and all other Ruffwear cooling tech products (vests, harnesses and brush guards) don’t work for humid environments. This is noted on their website, but in a discreet area)** …Kingsley and I moved back home to Indiana (humid) from Nevada (dry), which is why we are selling this. Worked great under his harness! Special Features Lightweight, cooling function, Durable, Easy to use, Reflective * Made for adventure: The Jet Stream is a cooling vest that uses shade and evaporative cooling to keep your dog cool during light and fast, high-intensity activities. To activate, simply wet the Jet Stream and wring out. * Stay cool: The layered construction is designed to keep your dog cool when the temperature rises. The outer layer reflects heat and facilitates evaporation while the middle layer absorbs and stores water for evaporation. * Stay comfortable: The comfortable inner layer transfers the Jet Stream's cooling effect to your dog. Additionally, the vest style offers UPF 50+ coverage and maximum shade. To activate the Jet Stream: 1. Soak in water 2. Wring out 3. Zip on your dog, and go. Washing instructions: Wash in cold water, gentle cycle with mild detergent; hang to dry. Do not bleach.