Kahuna 16ft Replacement Trampoline Mat RoundThese mats are manufactured using the highest strength polypropylene mat fabric. This gives a very high strength while still allowing the mat to 'breathe' with lower air resistance for better bounce, this design greatly reduces air resistance, especially on the rebound! Anti Graze: These mats are hot rolled after weaving to give the mat a smooth feel. This reduces the skin grazing effect experienced on many other cheaper quality mats. 8 Stitch rim: