The Soft Air Mesh Harness is adjustable to provide the perfect, custom fit. It is cleverly designed to apply even pressure on the chest and is trimmed in soft material to combat binding and chafing. This harness is the most humane way to walk your dog by eliminating undue pressure points and neck stain. Dimensions: X-Small - 5/8" x 10-16"Small - 5/8" x 12-18"Medium - 5/8" x 14-20" | Hamilton Products Inc. Soft Air Mesh Dog Harness in Black | Size Medium