I got it in a small, which is a good size for me. I have a small head. I think an XS might have been perfect but they did not have one nor do I know if they make one. I took all the inside liners out and I used a beanie that I made on my knitting loom. This allows me to wear my goggles under my helmet...style points. This helmet is SUPER light weight! Everyone comments when they pick it up at how light it is. It is a big bulkier in size than I am used to but I am learning to love it. I have taken a few head falls in the park and this has not let me down. It is rated for multiple big falls...which note that helmets will only protect you to a certain degree at high speed hits. When I had the ear pads in it there is so much padding that I couldn't hear what my friends were saying and I am a snowboard coach so I need to be able to hear, hence taking them out and doing a beanie. Overall this helmet is great, I put a pom pom on it to give it some extra flair. I would say buy this helmet, it will help save your noggin and brain.