I've always had an issue finding helmets that are large enough, due to my big head, size 7 1/2, and yes, I've heard all the "Big Head Jokes" that exist, so spare me :-)Point is, for me, "One size fits all"... doesn't. So, I Googled "Bicycle helmets for people with big heads" and this model came up in the search. When I found it on Amazon with generally high ratings, I took a chance. I have to say, not only does the helmet appear to be well constructed, the straps are fully adjustable, and guess what???? IT FITS! Yes, I got the XL, just to be sure, but not only does it fit, there is actually an extra tiny bit of space, so I had to use the rear fit adjustment. First time ever! Also, that extra space should allow me to add a head durag, for when it's chilly out.Also, I just got back from it's first road test, an early morning Arizona ride, where the temps hit 90F/32C+, the helmet felt well ventilated, and no sweat dripped into my eyes. I have to say, at this point, I love this thing. So far, so good.