The size is 28.5cm, US 10.5. I bought these around autumn and stored them without using them, but recently I tried them out for about 5 kilometers in a park and they didn't feel right, so I'm putting them up for sale. There is some dirt and signs of use, but I think they can still be used. I couldn't find the original box, so I will ship them in a box from another ALTRA shoe. ALTRA OLYMPUS trail running shoes, with a Vibram sole for excellent grip. - Brand: ALTRA - Model Name: OLYMPUS6 - Color: Black - Sole Material: Vibram Thank you for looking.