The castelli belgian bootie 4 overshoe castelli have improved the belgian bootie it used to be that the belgians would cut a hole in an old sock and turn it into a shoecover now our new belgian bootie features a double layer knit on the foot part to protect even better it39s cut high enough to cover a 9cm sock and the silver bands around the ankle are made with reflective thread for safety castelli belgian bootie 4 overshoe features 100 polypropylene construction for