Material:Nylon+Polyester 4 Colours:Red/Yellow/Black/Blue 5 Sizes:M-3XL Features: Durable nylon surface with soft Waterproof padded,comfortable to wear Reflective design,more safe to use at night Neck with wider padding strips, soft, breathable, tear resistant and chest areas for safety and comfort all the time This dog weight pulling harness is an amazing training tool to improve your dogs behavior and develop your dogs muscle and strength in a right way without hurting your dogs,it cana be used by pet dogs or by work dogs Package Include:1x Weight Pulling Harenss Size Details: M:Neck 11.5-15.5"(29-40cm);Chest(Girth) 19.5-27.5"(50-70cm);Back 19-22.5"(48-57cm) L:Neck 15-19"(38-48cm);Chest(Girth) 23.5-31.5"(60-80cm);Back 19.5-25"(50-64cm) XL:Neck 18-21"(46-54cm);Chest(Girth) 27.5-35.5"(70-90cm);Back 21.5-26"(55-66cm) 2XL:Neck 21-25"(54-64cm);Chest(Girth) 31.5-39.5"(80-100cm);Back 23.5-28.5"(60-73cm) 3XL:Neck 25-29"(64-74cm);Chest(Girth) 35.5-43.5"(90-110cm);Back 25-30"(63-76cm)