Giro Source MIPS & Giro Manifest Spherical

David Golay reviews the Giro Source and Manifest Spherical for Blister

It’s not hard to spend several hundred dollars on a mountain bike helmet, but should you? And what do you give up, in opting for a less-expensive option? We’ve been doing some head-to-head testing of Giro’s moderately-priced Source and high-end Manifest Spherical helmets to find out, and you can now read our full review to see how they compare.