Walk in the Sun
Beach sandals with transparent solar cells embedded in the straps that capture sunlight while you walk, storing energy in a slim battery within the sole. Plug your phone directly into the ankle strap USB-C port to charge while lounging on the beach—no power bank needed.
You're at the beach, your phone dies at 3%. Instead of packing up or tethering yourself to an outlet, you slip your foot into your SunStride sandal, plug in, and watch it charge to 60% while you finish your drink in the sand.