When I’m in Venice in winter, the wind that whips across the deck of the vaporetto (the bus-boat) can make a girl’s knees chilly. These super-quick boot toppers were designed to be worn next to the skin or over your favorite tights for added warmth. Tuck these into your boots, and secure them to your upper thigh with sexy garters or handy elastic. Then lean over the edge of the rail, hum ”O’ Sole Mio,” and watch for gondolas crossing the Grand Canal.