Etsy shop FlipSides sells flip-flops with engraved letters and symbols on their soles that leave impressions in the sand. You can also customize your order, making them a nice gift or advertising tool for your own business.
These comfy and grippy foam flip flops have the added bonus of built-in LED illumination, so you can see your path home after the sun goes down on a long day of hiking or beachwalking.
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