j.k4788735wrote a review of Castelli Gregge 12 Socks on February 22, 2016
The older I get the more comfort and performance of clothes matters to me. Castelli kit such as jerseys, jackets, gloves, shorts isn't top drawer IMO perhaps because it's outsourced to Asia, but I do think the socks (made in italy) are undeniably great. I love Exteondo kit for just about everything they make with the exception of socks where I believe Castelli is superior.
These particular socks are very comfortable. They aren't the warmest Castellis I've used but they are good for riding in 40 degree weather in the northwest and I just used them on a 65 degree ride in the Santa Cruz Mountains with no overheating issues.
Castelli builds great quality into this product and it should last many rides and wash cycles. I give them a big "thumbs up".
I'm a 10 sneaker size; 45 Sidi size and the Large socks fit just about perfect for me.