Keep your feet warm in these cozy Foamtreads Men's Mercury Slippers This lightweight, open-back suede slipper provides feet with extra warmth, thanks to polar fleece lining that wraps your foot with cozy comfort. The molded EVA insole cushions your steps, or you can replace it with your own orthotic. A durable outsole lets you wear the slipper indoors and out! Braided trim along the topline and outsole completes the look. Orthotic-Friendly.