Don't get puzzled. Zero glue, two pieces and a whole lot of comfort. Constructed with interlocking components, the ISPA Link was designed for disassembly and with the intent to use as few materials as possible. Spotlighting comfort, it places you directly on top of an ultrasoft foam midsole. The engineered knit upper keeps it airy and lightweight, while the bootie-like fit gives your foot a hug with every step. Get going, keep going—it's as easy as 1, 2.