Size selection: EU:35.5 = UK 2.5-5-EU 35-38 ; EU:39.5 = UK 5.5-8 - EU 39-42 ; EU:43.5 = UK 8.5-11 - EU 43-46 ; EU:47.5 = UK 12-14 - EU 47-50 Our design teams developed these running socks to protect your feet from the risk of blisters while you run. Running socks at a low cost? Thanks to their cotton yarn and thin, ventilated knit, they are ideal for low-budget running.