I was initially excited to get some socks that would stay up my calf and be sturdy.  I got neither.
The socks don't drop down the calf immediately but they slowly inch down, maybe it takes an hour or two before they are noticeably near the ankle.
An even bigger issue is that these socks make a mess!  I've seen black socks that leave behind small pieces when removed, especially after wearing them the first time but these - after washing even five or six times are shedding even more!  Every day I take them off the pile of small (and I don't mean infinitesimally small - these are sizeable) pieces multiples.  I tend to wonder if there will be anything left of these socks after another month - they will probably completely fall apart by then.
Buyer beware - I'd go to another brand.