Dartflex Loafers & Slippers BrownAstorflex's "Dartflex" loafers, constructed with unlined construction and calfskin leather upper, feature a slim silhouette with a low bowl inspired by Belgian design. The midsole and insole are made of leather to promote breathability and comfort. Single bottom ultraflex leather sole defines lightness and flexibility, while visible stitching emphasizes craftsmanship. Lightweight construction that keeps shapes clean and precise. Calf leather upper