the closed-toe slipper, the trausnitz, has been made of 100% pure, virgin, boiled wool. wool felt keeps feet warm in the winter, but that�s not all: the felt�s breathability also regulates foot temperature during the summer, which keeps your feet cool. a crochet stitch in contrasting color, as well as a cute flower appliqu�, make up the special eye-catching details in this slipper.