Every strap is saddle stitched by our leather artisans, involving over 100 stitches at 10 stitches per inch (SPI). Unlike lock stitch created by machines, a saddle stitch is more durable as it is made of two independent stitches that forms a knot at every stitch, and any break in the thread from wear will not result in the rest of the thread unravelling. Linen thread in 0.35mm thickness was selected for a fine and natural weave. These threads are used by highly skilled leather artisans worldwide.