The major components of a helmet, are the outer shell, the foam liner (SEPP for the POC Cortex DH), the retention system and the padding. The hard shell helps spread the impact over a larger surface (specifically to the liner), accentuates sliding and prevents object penetration. The foam helps prevent or reduce brain injury by managing the energy of an impact through its own compression or destruction, and it does that by converting a small part of the crash energy to heat. Its main duty is to slow the stopping process so that the head slows down during its inertial of the impact (deceleration). Our heads are soft and malleable, and the brain itself moves around inside a gelatinous ooze (cerebrospinal fluid). A major issue in crashes, is the coup-contrecoup (brain rebound) injuries, which can cause concussions, contusions, DIA’s (diffuse axonal injury) and even epidural hematoma.
All things considered, the POC Cortex DH is an excellent helmet! POC is at the forefront of safety in regard to multiple sports (snow, bike, skateboard) protection, and the Cortex DH helmet is the epitome of their substantial engineering and research prowess. I not only felt safer while riding the steep and gnarly, but I found myself riding with more speed and freedom down the trails. The multi-impact, anti-penetration and impact softening abilities are really nice features in this safety juggernaut. The ventilation works fairly well, but even for a full faced helmet it was slightly warm. The helmet was comfortable, lightweight and the simple buckle closure system was easy to adjust and put on.
I am looking forward to more continued adventures in the Danger Zone using the fine POC Cortex DH!
-Only 2 sizes
Overall Rating: 4 Flamin’ Chili Peppers
Size: M-L (55-57cm), and L-XL (58-60cm)
Weight: 1050 grams
Outer Shell: carbon
Inner shell: PC
Fit: LD Foam
POC Cortext DH url: http://www2.pocsports.com/products/showproduct.asp?category=10-Bike&id=10310