This handstitched design complements the look of Apple Watch series. Double layer full stitched leather watch strap with bund piece. Originally crafted for German aviators during WW2, the bund strap features an extra piece of leather within that protects the wearer's wrist from extreme temperatures. When the extra piece-bund is removed, the strap transforms into a classic watch strap. Single layer bund leather piece Full stitched by hand Apple Watch spring bar adapter Stainless steel buckle Full-grain leather