Too small for my head, which is very unfortunate. I typically can wear the Fuel Cells and Straight Link without too much pressure on my temples, but these are almost 2-3 sizes too small. Ended up giving them away as a gift, which makes me mad because they're really a nice pair of glasses. Very lightweight, and the construction is AMAZING. I love the carbon fiber design and the color. Overall I'd definitely recommend for small to medium head sizes.