The 675 is our roomier last: an almond toe with real volume in the toe box, shaped so the foot settles in with ease. For most men, that room is the point. For a slimmer or lower-volume foot, it can be a few millimeters more than you need — and a few millimeters is exactly what this set is for.
Two pairs, color-coded by thickness. The blue pair, 3.3 mm (0.13"), takes up a little room; the brown, 4.8 mm (0.19"), takes up more. Each is cut to the pattern of the 675 last, in your size and width, so it lies flat from heel to toe and stays in place on its own — no glue, nothing to trim. Both are made of Dry Alive™, a microfiber eight times more breathable than calf leather and odor-resistant, so the extra layer breathes with the shoe.
Reach for it if you went half a size up in D to make room for a wider foot, or once a pair has settled — a Goodyear-welted shoe sits on a cork bed that molds to your foot over the first weeks, and the fit opens a little with it. On a loafer, where there are no laces to take up the slack, it is the adjustment.
Start with the blue. Built on the 675, finished to your foot.