The canvas wall tents are made of 10.38 oz. preshrunk marine grade army duck canvas treated with sun forger to make it water repellant and mildew resistant. All seams are folded and double stitched with a lock stitch machine. All reinforcement patches are angled and match up evenly with adjoining patches. All corners, both on the sidewall and the ridge, are reinforced for added durability. The eave of the tent is stitched down to the wall between grommets to insure proper drainage.