Castelli venti sock castelli caf on the castelli venti sock for those of you who think the quindici is too short say a big fluffy merino warm welcome to the venti with a full 20cm cuff this 100 merino wool winter sock is ideal under your tights on the bike or under your suit in the city winter cycling socks used to be 9cm because theyd always been that way but we had cold feet so we made some 12cm socks and they were much better then we went to 15cm and they were better still it se