BTW, kids, just so we're all up to speed: MIPS is a proprietary design which seeks to reduce rotational energy to the brain in a crash. MIPS is licensed to numerous helmet companies.

Other companies have their own in-house designs that seek to reduce rotational energy to the brain in a crash: 6D with their Omni-Directional Suspension, Kali Protectives with their LDL, Leatt with their 360º Turbine, POC with their SPIN and probably others.

Other 'beyond safety tests' considerations besides weight and ventilation: rounded exterior with no snag points, slick outer surface that slides instead of catches, extended rear coverage, dual density foam energy management.