Abstract: A modular footwear construction includes an upper with a removable outsole. The upper and the outsole both include bottoms having tread surfaces. A removable footbed fits inside the upper, and includes both a cushioning midsole and a structural plate. The outsole is removably secured to the upper without adhesives. In one embodiment, the midsole and the plate each have structure that enables a mechanical interlock therebetween. In another embodiment, a heel strap extends from the outsole and fits over a protrusion on the upper to removably secure the outsole to the upper.