Pair of Kings Men's Quads Monk Strap Leather Dress Shoe Leather We make our monk strap dress shoes toxin-free by vegetable-tanning them. Our expert craftspeople hand stitch every single dress shoes. The leather used is 100% real full grain upper calfskin. To be lightweight and flexible, the leather monk straps were made using the Blake construction method. Our loafers are lined with memory foam to ensure a comfortable feel all day.