I purchased this product to keep the frigging flies off my head and neck a bit while I run on trails.  If you're worried about it not fitting your large head, do not fret. I have a size 8 head (usually the max size you find for fitted hats, although there are larger) and there is still some room for a larger size. That being said, as a result, the flaps in the back aren't as long as I thought they would be, but they are still sufficient.  The material is also a little different than I imagined, but it's not bad either. One of the other reviews states that the stitching came loose, which I can see happening, but it's rather inexpensive to test.  All in all, if this looks like what you're looking for, you shouldn't be disappointed.  GO FOR IT