I love this hat! Very comfortable, breathable and looks great. Sheds water, at least in light rain. Very visible in low light conditions. I mainly bought this to increase my visibility when running in winter evenings, and it is perfect for that use. Works for me on runs in the 40-45 degree range so far -- seems breathable. I will say that it probably runs a little large. I have a 7 3/4 hat size, and generally "one size fits all" hats are too small for me. I bought this because I saw a review on another site that mentioned it ran large. It does run a little large (so it can fit me when I expand the adjustable strap as far out as practical), but not crazy huge or anything like that. If you sometimes find that "one size fits all" hats are too big for you, then you should probably give this one a miss. Otherwise, great hat and highly recommended.