Use for 2 years underwear made of merino wool when it comes to physical activity, the socks I use almost daily. Even in summer the 200 because they keep your feet dry (sweat guided away from the feet)
Extremely comfortable (super soft) and durability characterizes these socks. Even the 2-year-old are still quite.
These here are the height of a tennis sock and not laterally revised label, so that the socks are so plain!