The Slimmy R1S1 (78mm) in the black colorway with white stitching eliminates excess layers for maximum slimness (4mm) and designed to perfectly fit credit cards and your ID. The center pocket provides fast access to cash and cards. Side slots accommodate less used cards and create tension to keep things tight. The R1S1 is the smallest format Slimmy, tailored to 68mm for maximum compactness. Excess layers of leather eliminated (4mm thin). The center pocket provides fast access to cash and cards. Side slots accommodate less used cards and create tension to keep things tight.