The sock uppers were changed at some point since I last purchased them. Its a far less effective quality material that will not stay up over the calf. I have a three year old version that is so much better up top than the new ones I just purchased. I wear these every day and they lasted three years before I wore holes into the heels. They would never fall below the calf or need to be pulled up. The new version is disappointing at best, especially for the price. I loved these socks and would even pay a higher price to get back the quality they once had.
Even after a year, these socks still do not fall down off the calf. Excellent socks, the best I've ever purchased!!
Long EMS shifts can put a lot of demands on uniforms, and especially socks. These stay up, stay dry and stay comfortable. My favorite of 5.11's sock offerings.