Always on the look out for interesting, high quality brands we found American Trench and got in a selection from their sock range. The American Slub is quite simply the best slub boot sock out there. The rugged cotton blend slub yarn is mixed with wool and acrylic for optimum breathability, warmth and softness. The spandex in the sock sticks to your leg like glue; they don't fall down at all. It's the perfect boot sock and works great as a hiking sock.