My 3 year-old son with a big head LOVES it!
We tried a number of helmets to fit my 3 year-old, and none would give him a good fit. But the second we put the Giro Xen on his head, he would not let us take it off. He took it to his first day of school (we drove there, no bikes!) because he said it protected his head and it kept him safe. The helmet that my son won't take off is the best helmet of all, in my opinion. I tried it on and once adjusted it fit me well, so he has a good while to grow with it. It sure is light! Now I am thinking I want one for myself...