HAFLINGER CLOGS All-natural materials, such as boiled wool and wool felt, are real miracles of breathability, flexibility, and sturdiness promising to keep your feet pleasantly dry and ventilated at all times, snuggly warm throughout a cold winter and nicely cooled during a hot summer. The popular women's and men's wool felt clog comes in different varieties and sizes, but always with the same reliable and healthy cork-latex footbed that will mold to the shape of your feet and support your arches.