Merino wool
Merino wool is a natural wool product that comes from merino sheep. Merino wool is temperature-regulating, warms even when wet and does not absorb the smell of sweat. Even if the socks get wet, the feet won't get cold.
Merino wool is also much softer and thinner than regular wool, which offers good opportunities for producing thinner socks.
Finally, the merino wool that mpDenmark uses has been given a so-called Superwash treatment, which makes it possible to wash the socks at 30° in a washing machine.