Silicone Head Harness features center vents for ventilation and reinforced holes for durability. Silicone Head Strap is non-sterile and molded for comfort. Silicone Face Mask Harness consists of four straps which provide good support of face mask and evenly distributes pressure over a large area. With minimal spacing between the holes on the straps, these designs allow for a wide range of locations to secure the straps to any sized individual. Silicone Head Harness is not made with natural rubber latex.