The Storm boiled wool, hard sole slipper will keep your feet comfortable year-round. Boiled wool is lightweight, soft, and sturdy, with breathability to keep your feet at room temperature all the time. A moisture-absorbing insole liner wicks away moisture. The latex-molded arch support insole feels like a built-in foot massage. An adjustable hook-and-loop closure provides a secure fit. The non-skid, waterproof outsole allows this slipper to be worn indoors or outdoors.