Details Redefined and reloaded, you'll appreciate the sleek aesthetic of the hidden EPS® Foam of the women's Giro Avera MIPS® Helmet as well as the beveled detail on the venting slider, so it can be adjusted easily while wearing mittens or gloves. Construction In-Mold Construction MIPS® - Multi-Directional Impact Protection System Fit The In Form Fit system makes it easy to dial in a custom fit in seconds - even with gloves on. An ergo-friendly dial at the base of the helmet provides up to 6cm of adjustment and enhanced stability Ventilation Thermostat Control - Adjustable venting stack vent technology Details Compatible with aftermarket Giro Audio Systems by Outdoor Tech CE EN 1077 certification Helmet Size S:52 - 55.5 cm M:55.5 - 59 cm L:59 - 62.5 cm XL:62.5 - 65 cm Weight N/A Giro Avera MIPS Helmet Women's