Mountain bike helmets divide roughly into three categories based on riding style. Open-face trail helmets cover most riders — lightweight, well-vented, and designed for the exposure level of typical trail and cross-country riding. Convertible helmets like the Bell Super 3R MIPS and Super Air R MIPS add a removable chin bar that flips on for technical descents and comes off for the climb back up, making them versatile enough for riders who mix trail and enduro terrain in a single ride. Full enduro helmets prioritize impact protection over ventilation, built for the sustained fast and technical descending that demands it. MIPS — the low-friction liner that allows the helmet to rotate slightly on impact — is standard across most serious options in the collection. Giro's Spherical system takes the concept further with a ball-and-socket construction that allows full-range rotation, addressing rotational forces more completely than a standard MIPS liner.

Bell leads the collection with three Super-series helmets — the Super Air R MIPS, Super Air Spherical, and Super 3R MIPS — all built around the convertible chin bar concept that makes them work for both trail riding and enduro descents. The Kask Defender brings Italian engineering to dedicated enduro protection, and Giro's Insurgent Spherical rounds out the premium tier with Spherical MIPS technology in a full-coverage enduro design.

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