Update: I bought a helmet yesterday although it was for a different purpose than biking. I'm getting a freebord this week and I know that I'll be falling off of it alot. http://www.freeboard.com . It's a BMX helmet because I need a little more durability in minor crashes. I am trying it out on my commute today and it didn't seem too hot this morning. The afternoon ride will really be the benchmark, though.