A great pair of socks make a big difference in foot comfort. So Castelli made the main foot part of the sock in their air mesh to enhance breathability and give it a central foot band for support. The ankle cuff is 6cm high for just the right length and features a top band that is doubled over so that the elastic will stay perfect over time. The Meryl Skinlife fibers contain naturally bacteria-static silver ions so that bacteria will not grow in your shoes, yet it doesn't harm your feet.
These are very nice socks, a bit pricey though I guess the Castelli brand is responsible for that, there is not much of a difference with other less expensive socks.