Smozer Dog Harness,No-Pull Dog Leash Harness, Adjustable and Heavy Duty Denim Dog Training Walking Leash Collar for Small/Medium/Large/X-Large Dog Durable Materials: Made of strong denim cloth, wear-resistant and durable Adjustable Harness: Every harness can be adjusted by using the hard plastic rings. Please note it is made of denim cloth, it is necessary to be washed before your first using. (Please don't put it in the washing machine, just hand wash it) It is made of denim cloth, please soak the harness and leash in the brine for half an hour, then clean them and dry before your first using. Medium size: 13.8-21.6 inches (Pet weight: 10lb--30lb)