Arborwear (Aerostich) Riding Pants, Knee Armor. The size tag says Men's 32" Waist, 30" Inseam. Note that these seem to fit narrower at the waist, more like a 30". They are in great condition (NO crashes!)
These are made out extra-heavy-duty canvas.
Metal zipper and button closure
Aerostich TF-2 Low-Temp Hard Shell Impact Armor in the knees, total size approximately 9" tall x 8" wide -- serious protection!
Two front pockets
Two rear pockets
One front tool pocket (great for a pen and a tire gauge)