I'm sure these socks work really well but unfortunately they are far too big. I checked the sizing guide and was very clear that I needed to order the ladies' medium size, as my shoe size is UK 7 (or EU 41). However, the socks are far too long in the foot which means material bunches up and rubs at my ankles or toes and would cause blisters if I was daft enough to try running with them on. Not what I wanted a part of the long distance running experience I bought them for.
However, I gave the socks to a male friend of mine who has much larger feet and he is delighted with them!
This sizing issue seems to be a bit of a problem; I bought some underwear as part of the same order and was disappointed there as well. I wasn't going to complain about the socks as I'd already said my piece with the pants, but have been pestered for feedback and, well, here we are! If I do decide to shop Runderwear again I will have to be able to try before I buy to ensure I don't waste any more money.