Authentic Puppia Soft Dog Harness made out of 100% Polyester. The size chart measurements are the dimensions of the actual product. Adjustable chest belt and quick-release buckle Comfortable padded neck opening. Make sure all measurements fit within the dimensions with a room to spare in the chest and neck. Please make sure neck measurement of your dog doesn't exceed measurement on the size chart Machine washable, but hand washing and air drying are recommended If you are looking for a harness that is adjustable around neck, and chest, we suggest trying a Puppia Ritefit Harness. See the pictures of dogs wearing Soft Harness at the bottom of page for your reference (7.5" neck girth / 9.0" ~ 13.0" chest girth)