Anon Echo helmet features the In-shell 360° Boa® Fit System for easy, on-the-go fit adjustment with the turn of a dial.In-mold shell construction offers the best in comfort with a sleek, low-profile fit and feel, while MIPS (Multidirectional Impact Protection System) on select colorways provides advanced protection against angled impacts. The Goggle Ventilation Channel brings in fresh air to prevent google fogging. Active Ventilation gives you one-handed control over 12 total vents, so you can fine tune your temperature depending on the weather and activity