This harness set is too small for my Frenchie (he wears it in large). The harness has been sanitized and the leash is still new in its packaging. M - Chest 16"-18.5"]; [L - Chest 18.5"-21"]. Leash length: 4.9ft(150cm). STEP IN HARNESS: Step-in design lets your dog spend less time wearing it, just put their front feet into the hole, close the hook and loop fastener and snap the buckle, finished. NO PULL NO CHOKE: The use of double D-rings can strengthen the connection between harness and leash, not easy to swing, and prevent suffocation and pull. Soft edge prevents the dog's fur from friction. LIGHTWEIGH BREATHABLE: The harness is made of polyester, this kind of fabric is super comfortable and feels good. Reduces the burden on the dog to carry it which is lightweight, and he will not feel tired when he takes a long walk outside. Air mesh covers the entire harness, no matter whether walking or running, the harness keeps the dog's body cooling. CLASSIC PLAID PATTERN: This model of harness still uses the plaid design of our brand (We have the patent), which is always classic and never out of date. Fashionable appearance makes this harness can be applied to any scene.