evo.com | Smith Bike Helmets > The Smith Mainline MIPS Bike Helmet takes the brand headfirst into a highly contested scene, and their first full-face is a winner. As lightweight and as comfortable as their half shells, the Mainline will shock you with its airy feel. If you're challenging yourself with bigger terrain and higher speeds, the confidence you'll get from this full-face is a welcome addition. You charge, but so do dentists: rock a full-face and only see them at your six month checkups! ASTM F1952 Lightweight Aerocore(TM) In-Mold Construction Koroyd(R) is a tubular core structure, patented worldwide and manufactured in Germany. Koroyd is not just an evolution of product; it is by definition a revolution in protection material, which is proven to afford a significant and even astonishing level of protection. MIPS System Equipped In a helmet with the MIPS Brain Protection System, the shell and liner are separated by a low friction layer that allows the helmet to slide relative to the head in and angled impact. EPS Inner with Polycarbonte Shell 21 Optimized Vents | Smith Mainline MIPS Bike Helmet 2026 - Large