VIA Waterproof Knit Shoes

Eco-friendly 100% weatherproof and breathable knit shoes

Eco-Friendly 100% Weatherproof and Breathable Knit Shoes - Made from Recycled Ocean Plastic
How breathable are they? Is there a demo video somewhere? What will their main use be (hiking/sport/casual/etc.)?
Just backed this project! Can't wait to try them!
You had me at Eco-friendly. But how can it be with the nanotech membrane you applied on the shoe? Does it come from an eco-friendly source? Is there an arch support option? Shoes that don't have it suck.