UPPER: Women's last and fit. Gore-Tex® XCR membrane for waterproof yet breathable protection and heel strap works with targeted overlays to add support.MIDSOLE: Phylon foam with heel and forefoot Nike Zoom units. Cuboid support and women's-specific crash pad. Dual-density. Ortholite® sockliner for her.OUTSOLE: BRS 1000 heel. Environmentally preferred rubber. Duralon inserts enhance cushioning and flex grooves deliver the right amount of flexibility for her.Delivers the women's-specific stability, fit and ride associated with the Structure franchise in winterized package for the colder, wetter months.