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The Castelli Rosso Corsa 9 is just like the Rosso Corsa 13 and 6, but with a medium-height 9 cm cuff. Identical to the other versions, they are woven with Meryl Skinlife antibacterial fibers. The sock is wicking and will help your feet stay dry in almost any circumstance this side of a rainstorm. The top of the foot is an ultra-thin and extremely breathable diaphanous web. In the middle of the foot, the arch area, a high-density band adds support. You won't notice any difference in thickness, but you will feel like the sock is becoming one with your foot rather than sliding around between your foot and your shoe. The toe has a flat seam for comfort and the cuff at the top is folded over to keep the sock from slipping.