I realize this question was posted many months ago, but in case you're still looking for a helmet - or in case other people are using this as an online resource to identify small helmets - I searched for over a year and was disappointed at how big all the Bell and Giro and Costco helmets were on me. I also saw an online review indicating that Schwinn helmets (the ones carried by Costco) are very big, so I did not go try those. Even though helmets have ziptite mechanisms to adjust their heads, I wanted a helmet that fits snugly so that I wouldn't have a double impact in a crash. I finally found one that fit very well! It's a Trek Vapor WSD size 49-57cm. I was just in a crash recently and am looking to replace it now - they don't make that exact model anymore, though they do make a similar one. My problem is that the new model doesn't come in the color of the old model... and I do have a bit of a matching scheme going with my bike gear! <sheepish grin>