I wear these socks for sport with runners and quite often with boat shoes or other casual shoes and shorts. [Boat shoes are notorious for making socks slip down.] These are the only short socks I have tried that truly do not fall down when I walk or exercise regardless of the shoes I am wearing. They have a moulded heel that fits exactly around one's own heel. Whilst they take an extra couple of seconds to put on, to fit around the heel, the result is fantastic – a sock that doesn't move or slip down. They are also comfortable and resist odour and do not make one's feet hot and sweaty. The only down side is they go grey fairly quickly – they do not retain their beautiful new whiteness for very long.
Have used for 10km runs. Nicely padded socks. No issues with them.