I ordered a size up for my son, a size 1, and in Nike and under armour tennis shoes he is about a 13. Also awesome that they came with a little cloth carrying bag. This makes them stay on your feet securely so that youd be comfortable running a bit, for example. It?s made for everyone with an active lifestyle and busy people. I am an adult male and have maybe a big head (size not ego - though some may disagree) and have been playing Oculus Quest 2 with my daughter who is 11 years old. Great quality, its as if I spent hundreds on them when I really didnt lol the fit is great too. They also fit most Turtle Beach and Logitech headsets. When not in use they were stored in pouch they came in. Fuma. I tried hard to find the ones I had grown to love, and thought I had but no luck.