Dr. Rosenberg's Instant Arches for sandals and flip flops with its unique patented design makes every step instantly more comfortable. Designed strictly for sandals and flip flops, they convert every pair in your shoe closet into a wonderful walking experience. Take pressure off the balls of your feet and prevent soreness from fatigue when walking or standing. These spongy and durable foam arches message, cradle, and support your feet with every step. And She Walked Happily Ever After®.