The pants are made of a "smooth cotton" as the description says. Almost a thin dress pants-khaki material. Seems very cool and airy. The laces allow for slight size adjustments as needed. Even has front pockets.
The fit of the pants is pretty good, I got the 29x30 size. However, with the taper at the bottom is a little tight on the calves. Otherwise a great pair of medieval trousers.