Like some kind of strange modern mermaid apparel, these sleek-looking sandal-shoes can transform into a likewise stylish pair of swimming flippers with a few quick motions. While designed fore lifeguards specifically, what beach denizen would not want such nifty convertible land-and-water footwear?

The wide base is ideal for walking on wet land or sand, broad like snowshoes to disperse the weight of the wearer. Sort of like all-in-one skis, boots and bindings, the strap-on attachment flips out into the fin portion in with minimal fuss.

For now, these are just a working prototype by Edward Shelton but the concept makes sense and mass-production is sure to follow. After all, they already have built-in boot-and-ski, shoe-and-roller as well as other footwear combinations … so why not all-in-one sandal-and-flippers too?