L: fit for dogs chest 24.8-30.3inch, fit for dogs neck 21.2-26.3inch, fit for dogs weight 33-66LBS. (Size Chart on the left) Size is very important, Please confirm it. DIRECTIONS ON THE LEFT SUPER COMFY: Dual NECK & CHEST ADJUSTABLE straps with SOFT NO-CHAFING sleeves makes this your pet’s favourite harness. COMFORTABLE & DURABLE FABRIC: Breathable and Soft, Your pet deserves the BEST! NON-CHOKING: Won't harm pet's sensitive throat & trachea unlike collars, especially if your dog PULLS or LUNGES. REFLECTIVE threads sewn ALL around ensures safety & visibility at night. PUTS ON EASILY: Wearing it is a joy for you and your pet. Don't have to LIFT A PAW or step in to put on. Literally CLIP-ON & GO! Taking it off is just as easy.QUICK-RELEASE, HEAVY-DUTY buckles for the ultimate convenience. NO-TANGLE: Won't cause lease to tangle, unlike collar types STURDY SAFETY HANDLE: Gain IMMEDIATE CONTROL of your dog in TRAINING & EMERGENCIES. HELP dog out of water, PHYSICALLY CHALLENGED pets into