My SO had a crash at 12mph on flat ground last summer. On a night ride a huge raccoon ran out of a ditch and knocked the bike right out from underneath him. He never saw it. He went straight down on his side and was out cold for several minutes. He had a grade 3 concussion and a minor brain hemmorhage (sp?). He had a Giro helmet. The foam pretty much shattered. He replaced the helmet with a Specialized brand, as they are SNELL approved (Bell/Giro is not) and seems more robust than the Giro.