Troy Lee Designs D4 Carbon MIPS BMX Race Helmet-Inferno Gray Helmet Size:Adult X-Small There are ten adjustable pins

There are ten adjustable pins on each side of the concave and really thin platform

Engagement System: Stealth Technology™

*Full floating seat surrounded by stretch-rib material

Researched and developed to optimize ventilation

15mm 4130 chromoly female axle

Troy Lee Designs D4 Carbon MIPS BMX Race Helmet-Inferno Gray Helmet Size:Adult X-Small There are ten adjustable pinsThe Troy Lee Designs D4 Carbon MIPS BMX Race Helmet weighs in at just about 1 kilogram making it one of the lightest helmets in the game. The D4 incorporates the MIPS brain protection system to help prevent rotational stress resulting from angled impacts. Instead of steel, the D rings are titanium to get just that little extra bit of weight saving. The EPP collarbone impact system is a specially designed area to help mitigate helmet collarbone