Part thigh-high boot, part femme-bot leg, the crazy concoction in the center of the image below is one of a four-style collaboration between Prabal Gurung and luxury shoemakers Casadei. Seen on the designer’s fall runway, the small feats of engineering—in suede, croc-print leather, or snake—feature the Italian company’s Blade heel, basically a five-inch razor-like blade welded to the upper sole. For the squeamish out there, lavender has a softening effect, but really, the squeamish need not apply.