With a convertible mountain bike helmet like the Parachute MCR from MET, you can have all of the protection you want, with a lighter weight and cooler package for climbing.
The Specialized S-Works Prevail II and Propero III bike helmets are nearly the same, offering MIPS protection and an electronic crash sensor, but differ in price quite a bit.
Though Smith Optics' new Forefront 2 mountain bike helmet shares its name and aesthetics with the previous iteration of this lid, it is, in fact, a complete re-design from the ground up.
