100% nylon. Waterproof Pertex ripstop fabric. Taped seams. Five panel construction. Webbing strap at back with plastic buckle. One size fits all. Here’s a useful bit of kit – the Shieldair Jet Cap from Goldwin. With that five panel construction and tasteful forest green hue, it’s very easy on the peepers, but this is more than just a pretty face – it’s been made from some waterproof Pertex ripstop and those seams have been welded shut, meaning no droplets will taint your bonce in even the heaviest of downpours.