So I usually wear a medium in many POC products most recently the Receptor Backcountry MIPS. I got this one in a medium on advice from a few sources and find they were all way off. This one does not run smaller like the Backcountry. This one is at least a full size larger than what will fit me. If your like me and in between the sizing chart POC has posted, then size down, you won't regret it. Aside from that hard to give an honest review until I have actually used the product on the hill... When I get the replacement I will fill y'all in!