I ordered 3 pairs of different brand for walking and running (this one was the most expensive). During my two trips with this pair, slight warming of the vault and early bulbs. Why? I'm not at all an expert in this field, but it seems to me that the sock is too fine (despite his reinforcements), the material used must be probably too synthetic (38% Polyester, 58% Polyamide, 2% Spandex ) may be missing some cotton in there and that from the moment your feet moving or slipping in the shoe ... It's fucked.
I hesitated before putting this comment, then I say, after all, different pairs I've used fifties without problems and if so seems to cause me a beginning of bulbs, so to say.
HOWEVER ... I repeat, not being expert in the area of the sock I can certify that this problem affects everyone and that it is the opinion of a quite personal. Nevertheless, I am surprised to have had this problem with a product of this brand.