⚡ Kinetic-Energy Harvesting Sandals
TumbleWatt sandals generate electricity with every step, stored in heat-resistant supercapacitors. Power your GPS, satellite phone, and emergency equipment in the most remote desert environments— where traditional batteries fail in extreme heat and solar is unreliable during dust storms.
You're 15 miles deep in Death Valley. Your satellite phone died at 2% in the 110°F heat. You've been walking toward camp for 3 hours. You sit on a rock, plug your phone into your heel, and watch it jump from 2% to 47% in just 20 minutes— powered entirely by your own footsteps through the desert.
Supercapacitors withstand temperatures up to 150°F—where lithium batteries fail.
Every step generates ~0.085 watts. 10,000 steps = enough to charge a satellite phone 45%.
Sealed encapsulation protects internal components from fine desert dust and sand.
USB-C output in the heel module works with GPS devices, satellite phones, and emergency beacons.
$349/pair • $99 preorder deposit • Shipping Q4 2025
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