MSA Standard Size 1-Touch? Replacement Suspension designed for topgard and thermalguard helmets features one-hand squeeze opening for convenience. Suspension with 1-hand slide adjustment and snap closure offers optimum comfort as well as stable fit. Suspension with adjustable dual nylon straps meets all applicable requirements of ANSI Z89.1-2003 for type I helmets. It is third-party-certified by the Safety Equipment Institute.