I run now - with interruptions - for over 20 years. Have just the first time this compression stockings tested. Am thrilled to have extended times my usual distance just 25 per cent, would have been even more in it ... No heavy legs during the race and after. If I had not thought of. The stockings sitting super, quality, I can not judge, because so far only used once, but acts dibasic. I have shoes size 42-43 and have ordered the stockings in 39-42. Without but have to sit tight feel that the blood circulation would be limited.