Thinking about thermal performance in a new and unexpected way, we created the Future Vent" sock concept. Going in all directions, changing everything we could think of, we changed the size and quantity of the ventilation channels. As a result, we're much more efficient at ventilation and even lighter. By turning the channeling system inside out, integrating it into the sandwich construction of a double-layer sock, we then create something totally new. What's more, it combines silky-soft merino wool with linen, creating a luxurious fabric that naturally regulates moisture. These socks also incorporate the incredibly light, elastic and quick-drying Pure-IC biobased yarn. This innovative dual construction, combined with excellent natural fibers, creates the essential high-tech Trekking socks."