I really enjoy this helmet for its comfort and reliability. It fits my head very nicely and the vent adjustment is very easy to do on-the-fly. I have had this helmet for two years now, and have used it in conditions varying from -15 F at Jackson Hole to 50 F at our local "resort" here in Ohio. In both situations I found a comfortable vent setting that worked for me. The only reason that I gave it a 4 is because the wire is pulling out of the box where you adjust the volume and take calls, so I will probably have to take it apart and resolder it later this season. Great product otherwise.