Stilo ST5 FN ZERO FIA 8860-2018 Carbon Helmet - Carbon Fiber M59XLC 4 suit is rated to

4 suit is rated to the SFI 3

Certain circumstances may require you to need a different length tether

The Meru ASCENT is SFI 38

adjustable Velcro strap

Stilo ST5 FN ZERO FIA 8860-2018 Carbon Helmet - Carbon Fiber M59XLC 4 suit is rated toThe Stilo ST5 FN Zero helmet offers the pinnacle of formula racing helmets. This 'Zero' version is constructed from high tensile autoclaved carbon fibre for exceptional strength and ultra light weight (it is the lightest FIA approved helmet available). These properties allow this helmet to surpass the latest FIA 8860 2018 safety standard with unparalleled levels of impact and puncture resistance. Electronics and side ports deleted for optimum weight