RAINBOW. 301ALTSN-NAVY. SINGLE LAYER PREMIER LEATHER WITH ARCH SUPPORT AND A HALF INCH NARROW STRAP. NAVY. The single layer premier leather sandal is made of top grade nubuck leather the top sole is embossed with the Rainbow logo. This model comes with a half inch narrow strap also nubuck leather it is double stitched and the nylon toe piece is secured with a box X stitch all using bonded nylon thread. The single layer mid sole and arch support is triple glued for maximum durability to our non-slip Rainbow bottom. We finish it off with the Original Rainbow woven label on the right strap the mark of a genuine Rainbow Sandal.