Going big occasionally means crashing big, so instead of tucking a lucky rabbit's foot into your pocket before dropping in, don the Troy Lee Designs D3 Carbon MIPS Helmet. It's at the top of the heap when it comes to fit, comfort, and resisting impact, with a super-adjustable incremental sizing system that makes it possible to dial in fit that's far more comfortable than you can get with a traditional dial adjustment. In addition to the lightweight carbon-composite shell, the MIPS system takes the sting out of rotational impacts for those inevitable times that see you bounce down a tranny onto your noggin. The shape of the D3 isn't radically different than the D2, but it does pack a little bit more foam into key areas and tweaks the cheek and jaw pads to provide a snugger, more comfortable fit. Dual-density shock pads around the shell absorb smaller impacts, but the sweetest feature might be the removable washable liner, made with washable Coolmax and Dri-Max materials that keep your dome cool, dry, and smelling like a daisy. 20 vents take the cooling up a notch or four, and the adjustable visor can be swapped out with the included second option for a different look.