Cotton, Spandex I like this version of the Ryder full pants. I've been wearing them for the last decade. It seems the new fabric is does not wrinkle as much as the older versions after washing. Mountain High Outfitters fulfilled my order completely, correctly, and quickly. Very satisfied with all aspects of this transaction. I have been wearing KUHL Men's Rydr Pants almost exclusively for about 9 years now. I ordered these and they are a good bit thinner than the older pairs I have. I don't understand why they would change a successful product, but, here we are. Aside from that, they are as you would expect. Ordered two exact pairs, one came with the snap, the other a button. Why is it a guessing game of which one you get? Just give me the button, no one likes the snap. Other than that, theyre one of my favorite pairs of pants