Size: M Size: Bust 39-56cm, Neck 38cm, Back 35cm, L size: bust 49-70cm, neck 44cm, back length 42cm; Material: breathable mesh surface + absorbent cotton + cool fabric, Function: cool down in summer, keep warm in winter. Cooling vest -- A vest that provides sun protection and evaporative cooling, keeping your dog cool when hiking, walking, camping,Perfect for hot summer activities Three layer cooling and Healthy -- The dog cool vest is composed of 3D mesh and polymer resinreflecting ultraviolet and excess heat the outer mesh layer can block ultraviolet light, the middle layer absorbs and stores water, takes away heat, comfortable inner layer transmits the cool to dogs.Breathable & lightweight 3D mesh which is safe and non-irritatingIt is healthy and comfortable to wear for all your dog range movements. Size adjustment and Collar-compatible -- The colorful straps on the waist are adjustable, allows for a snug fit that will not move around or slidevery comfortable for dogs.Comfortable binding design, with reserved position for connecting the traction collar, compatible with a collar and leash. Easy to use and Clean -- Soak it in cold water, wring it out (must wring it a bit dry), and put it on your dog. When the water almost evaporated, it can be re immersed in water and reused. When the cooling vest is dirty, it can be directly cleaned with water, very convenient. Reflective strip design -- The strap with 3M Reflective offer a high visibility for additional safety.when hiking, fishing, camping with your dog at night, others can see clearly, will be very safe.