I have a pair of these in large and it fits my 10.5 - 11 foot very well. They are not running shoes, the side/top material flows down to be the outer edge around the sole and may not hold up to repeated impact. They are more like great slippers you can wear outside or on the beach. The stretchy top bands work well holding them on and they are very comfortable for walking. You can feel the ground.

Clutchless 7