Keep your best friend visible. Blaze orange w/reflective material ensures your best friend is safe. Great visibility in any condition day or night. Water-resistant, cordura nylon shell with a ripstop liner for durability and protection. Quick release buckles.Size Back Length** Waist Circumference Weight* Small 12 - 18 inches 17 - 25 inches 25 - 40 lbs Medium 16 - 24 inches 24 - 26 inches 40 - 80 lbs Large 22 - 30 inches 24 - 36 inches 80+ lbs*Use weight only when measurements are not available.**Back length measurement is from base of neck to base of tail.