DOCO® Signature H-Harness (DCSN201) Special Features 100% high quality single-ply nylon  Heavy duty stitching for long lasting quality  Higher tensile strength than polyester  Nylon is resistance to mildew, aging and abrasion  Less pressure on the chest and neck  Heavy duty two D-Rings  Durable plastic side buckle  Tri-glide for easy size adjustment  Vibrant colors are easy to see at all times.