Spira’s latest athletic walker has the same patented Wavespring® engineering as their other models but this one has stretchable, breathable one-piece uppers of waterproof mesh. Lightweight stainless steel springs built into the sole unit at heel and forefoot provide high energy return and wear better than compressive foams. Removable Memory Foam insole. Full-length compression-molded EVA midsole. UltraGrip full contact rubber outsole. Men’s sizes 8–12, 13 and 14 in 4E and 6E widths.