One size fits most - bit small for my massive head, would definitely put it down in the Small/Medium range. 72% Cotton / 28% Polyester hat with flaps, warm fluffy flaps at that too. Fleece lined to keep you warm in the winter months Triple popper for underchin or over-bonce strapping Leather-esque patchwork to the side Embroidered detailing along the head band, which runs through a series of loops - looks like it should be elasticated or adjustable - it is neither, but just there to keep you looked both fly and fresh in equal measure.