Fits 2.5 to 20 lbs.We have XS-XL 5 sizes, specially Crafted Harness for small-medium Dogs and Puppies: Our pet harnesses are escape proof when with the correct size with a snug fit.Soft, gentle, breathable double layered mesh fabric made from non-toxic mesh fabric with durability built to last.Soft and extremely breathable light weight airflow for an enjoyable walking experience.We use environmental friendly material that is highly durable designed to disperse the dog's weight onto the chest to not choke the pet's trachea,specially made to not constrict dogs trachea.