Please note these sandals are listed in UK sizes so pick your usual UK size. (The number on the sole if you already own a pair is the Saltwater size and is written as one size larger than UK sizes!) So if you have a pair and it says 7 on the sole, that is a UK 6 and so forth. As with all of the other Salt-Water Sandal styles, the Retro Slide is made from their signature 100% waterproof leather and can be hand washed using warm water and a gentle detergent. Originally sold in the USA in the 1970s, Saltwater have updated the classic Retro from the archive collection into a modern and practical slider sandal. The Retro Slide in black is a great every day slider and works with all outfits - from boho chic to everyday office wear. It can feel a little tight across the foot initially but it soon stretches to the shape of your foot naturally.