Troy Lee Designs D4 Composite Full Face Mountain Bike Helmet Stealth W/MIPS (Gray) Size:Small low friction layer designed to

low friction layer designed to reduce rotational motion transferred to the brain from angled impacts to the head

tool-less visor replacement system

Extended foot peg riding zone for arch and riding on the balls of your feet

As the temps increase throughout the hotter months of the year

anti-slip reinforcement

Troy Lee Designs D4 Composite Full Face Mountain Bike Helmet Stealth W/MIPS (Gray) Size:Small low friction layer designed to20 high flow intake and exhaust ports for maximum ventilation; Added eps and new headform shape for improved impact performance; MIPS Quick release and contoured 3D cheek pads for emergency helmet removal Removable snap in washable comfort liner with Coolmax and Dri lex moisture wicking materials; Super light titanium D rings save weight and have increased material tensile strength