Oh, the reunion of air to skin! Such joy accompanies the approach of summer, as sandals and flip-flops are dug out from the depths of closets across NYC. With summer brings the age old question- are flip-flops bad for you? Unfortunately, literature on their effects is found wanting. Research has been limited in controls for variables such as age, gender, musculoskeletal pathologies, arch types and height, cushioning, and footwear, to name a few.