It's a plastic strap that wraps around the shoe and reforms to its original shape when it cools down - kind of like a retainer brace. Stops the shoes from flattening out too much over time. In my opinion it works pretty well.
Fri Night Vid Tropical Lines - New Routes in Brazil
This week's Friday Night Video takes us to Brazil in 2023 when Felipe Camargo travelled across the country with his brother, Bruno, hoping a leave a legacy of hard routes for future generations of climbers. Inspired by surf and skate films, the...