【Materials/Components】 (Fabric) Outer layer: Polyester air mesh, Middle layer: Polyester non-woven felt, Lining: Dry Wave polyester mesh (Bluesign certified), UPF50+, (Buckle:) Side release buckle (ITW Nexus), (Weight) 300g (size M) 【Functions/Features】 This cooling wear cools your dog using evaporative cooling. The fabric has a 3-layer structure using Ruffwear's unique Swamp Cooler technology. The moisture-wicking outer layer reflects heat and promotes evaporation, the highly absorbent middle layer stores plenty of water, and the mesh lining keeps your dog dry and comfortable. The middle layer is designed to hold more water so that the cooling effect lasts longer, as the water absorbs your dog's heat when it evaporates. Use by soaking in water before wearing, or by pouring water from a water bottle or faucet. When it dries, you can recharge the moisture by pouring water on it while wearing it. The UPF50+ light-colored fabric reflects and blocks sunlight, protecting your dog from the sun. It's easy to put on with a side-release buckle, and the size can be adjusted with the adjuster. There is also a leash portal on the back, so you can wear it over a harness. 【Safety】 The fabric complies with UPF50+ and protects your dog from the sun. It has reflective trim for excellent visibility in dark places, and there is also a loop on the back for attaching a beacon. 【Color/Size】 (Color) Bioluminescent Blue (Sizes) XXS, XS, S, M, L, XL 【Care】 Fasten the buckles and wash in cold water with a gentle cycle and mild detergent, and air dry.