lat4967161wrote a review of Castelli Thermolite 13 Socks on November 7, 2014
Familiarity: I've used it several times
These socks were warm and comfortable but they only lasted one season. I think I should have gotten at least two. However, they never lost their stretch o comfort. They just developed a hole near the toe.
I rarely tide below 50 deg F and I use a toe shoe guard when it gets colder. These socks work well for me down to about 55 deg and then I start wanting the guard.
I have probably worn them 50 or 60 times on rides over 30 miles.