Designed for long-distance runs, multi-day runs, recovery runs, and tempo runs; Dual-layer midsole construction; CircleCELL supercritical foam top layer for responsive energy return; Rubberized EVA bottom layer for support and stability; TUNEDFIT Dual Lacing System allows separate forefoot and midfoot adjustment; Wider base and higher sidewalls enhance stability; Recognized with APMA Seal of Acceptance for promoting good foot health