Non-Slip Waterproof Ladies Flats. Flat shoes are a must-have for any women's wardrobe, and they can be worn with almost any outfit! These flats can go with any formal or casual look, and they are sure to keep you comfortable throughout the day. These flats come in a variety of different colors and sizes, so there is sure to be a pair for you. These shoes are Non-Slip and Waterproof.