Aspen indoor-outdoor slipper the aspen's super relaxed look, cool moccasin stitching and warm, faux sheepskin lining will make you the man of the mountain. like all deer stags slippers, the aspen is made with our trademark s.u.p.r.o.® sock, a thick orthotic with extra heel cushioning. on the outside, enjoy great shock absorption from a thermoplastic rubber sole (with compression nodules for relief) and a protective toe bumper.