The GR-501's rate a 2 out of 11 of Shimano's stiffness chart so they are very much at the comfort end of the spectrum

providing you with ample illumination to confidently navigate dark roads

The BOA® Li2 dial delivers a micro-adjustable fit that stays secure through high-speed descents

but with a lighter

Bell Sixer MIPS Helmet - L - White / Black PDP|PLP|Rail Material The GR-501's rate a 2The last thing you want to be thinking about in the middle of a long backcountry ride is your helmet. It should be well ventilated. It should protect your head. And it should fit so well that you don't know it's there. The Sixer Mips takes to the trail with their Mips Evolve technology, resulting in a sleeker, closer to the head fit that combines with their Float Fit system and proprietary Sweat Guide to ensure unprecedented comfort in a helmet.