A waterproof, breathable Acquastop membrane keeps your foot dry in this chic little bootie without making it feel sweaty, and a temperature rating that goes down to 5? Fahrenheit keeps you warm, whatever the weather. The foam- and latex-cushioned footbed adds comfortable support and extra underfoot insulation, and a naturally warm and comfortable merino wool lining wicks away moisture and feels soft against your foot when you want to wear the