Used these for about 2-3 years.
Knee length, the knitting of the socks features several compression panels/stretch zones and also several cushion zones on the sole and arch and come as left and right fit.
I wear these for training and also used them on the Outlaw for the bike and run. No blisters or rubbing and no calf problems. In wet weather they do not feel wet, heavy or cold and in hot weather they feel comfortable and well ventilated.
Cheap and cheerful about £8 or so and well recommended as part of your training arsenal.
They come in white and black, I have white, pop them in the white wash and are a bit grey but think that is down to my washing techniques.
Edit: Just worn them on Outlaw half for bike and run. Legs in tip top shape. £8 a pop got to be worth a try.