Magnificently versatile and built in a sustainable fashion, these waterproof Duality At1 shoes come with two pairs of insole/midsoles. They transform from soft everyday shoes to harder backpacking shoes by simply changing the insoles. A genuine Gore-Tex membrane keeps your feet dry in all conditions. - Waterproof, thanks to Gore-Tex - Surface fabric: 1.4 - 1.6 mm thick nubuck from a gold/silver level tannery - Waterproofness has been tested with a 200 000 stride test - Outer sole is made of a compound that gives great grip even in the wet, with added AHAR Plus components at the heel for durability - Heel and toe reinforcements - Laces, pull loops and seam thread are made of recycled polyester - The tongue and shaft have pull loops for easier use - The Bloom Foam used in the insoles is algae-based This is a PFC-free product.