From the L.L. Bean website: Our Storm Chaser Slip-Ons perform the way high-tech all-weather shoes should, only they're lighter and sleeker - with all the comfort of sneakers. The rugged rubber outsole is not only built for stability, but flexibility too; the cushioned EVA midsole ensures all-day ease - and both are built from the same materials as top-of-the-line walking and running shoes. My husband wore them once and then never picked them up again so we are cleaning out his closet.