The castelli promessa womens sock has a meryl skinlife construction ideal for cycling on those hot summer days helping to keep your feet cool and dry the high density elastic mid foot support band ensures supreme all day comfort these castelli women39s cycling socks also feature a diaphanous web on top of your foot to offer you increased ventilation castelli promessa womens features meryl skinlife antibacterial fibres diaphanous web on top of foot high density elast