The Puppia Soft Mesh Dog Harness is the original, best-selling soft harness for dogs designed with style, comfort and safety in mind. This authentic Puppia Soft Harness is made of 100% polyester air-mesh, which is lightweight, breathable and super soft to the touch. Additional features include an adjustable chest belt with quick-release buckle, a comfortable padded neck opening and a Puppia rubber label for authenticity. Machine washable. *Actual measurements of product, not the dog. Choose size based mainly on dog's chest girth fitting within these measurements with a little room to spare. SIZE Neck Girth Chest Girth (Most Important) Dogs Weighing XS 7.5 in. 9~13 in. Up to 4 lbs. S 9.8 in. 12~18 in. 4-10 lbs. M 12.5 in. 14~21 in. 10-20 lbs. L 14.0 in. 19~29 in. 20-35 lbs. XL 15.7 in. 21~32 in. 35-60 lbs. XXL 19.0 in. 26~39 in. Over 60lbs.