Nylon Reflective Service Dog Harness Adjustable Vest Come with 2 Removable Patches Made from good quality nylon outside,inside vest is slighty padded,soft and comfortable,heavy duty D ring and clip . SIZE S : Chest girth from 19.7 inch to 23.6 inch.Please measure carefully before purchasing. Have 2 removable patches with reflective "SERVICE DOG" lettering in each side.You are able to replace them with In training patches if your pup is training. Reflective strip on front chest add security when bn walking at night.Goes on and comes off easily once it's adjusted to size, simple on and off after that. Easy for people to see and recognize your dog is working and not to distract it.send a clear message to the public that we are training and don't want to be interrupted.