Giro Manifest Spherical Bike Helmet ReviewThe Manifest Spherical is Giro's top-of-the-line bike helmet and that's apparent after wearing it a lot over the last two months. I am a gravel biker and wanted to opt for something on the safe side. My gravel rides take me on asphalt, gravel roads, single or double track and the occasional mountain bike trail (sans wet roots and baby's heads SVP). There are quite a few bells and whistles on this helmet, and, as with any well-designed piece of gear, they are barely noticeable.
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