This stunning slipper has many key comfort features which include, Moisture-Absorbing, Insole Liner which is a soft and breathable boiled-wool, insole liner wicks away any moisture from your foot all year round. It has a Breathable Boiled Wool Upper: Natural Boiled Wool is very lightweight, soft and cuddly, yet very sturdy. It molds to the foot like a second skin while letting the foot breathe freely. It is the breathability of boiled wool that will keep your feet at room temperature all the time, never giving you the hot, perspiring foot so common to synthetic slippers. Furthermore, wool is a natural insulator: it keeps your feet cool in the summer and warm in the winter, guaranteeing year round comfort! Latex-Molded Arch Support It is so important to continue your foot support into the evening after a long day on your feet! Our natural, latex-molded arch supports create the most relaxing, wonderful sensation it feels like a built-in foot massage, always pampering your feet and easing your mind!. Outdoor/Indoor, Waterproof Outsole: Our non-skid, waterproof outsole provides additional protection and stability for those who have the occasional outside shore like walking the dog or getting the newspaper! An extra layer of felt between the footbed and outsole will further cushion your every step on all surfaces.