Throwdown's Air Max headgear has a combination of leather and mesh for the exterior, maximizing ventilation/airflow and durability. Beneath the leather/mesh outer shell is a shock-absorbent 3-layer foam padding system with cheek protection. The interior includes an ID Tag so you can write your name directly on your headgear to prevent confusion or theft in the gym.
How do I tell whether I'm a Large or a small?
Measure the circumference of your head , 23.5 and above is large. Below that is medium. Probably to late to be useful.
What Smoke said.
To size correctly, measure around your head at just above your eyebrows.
You'll get a measurement that's between 22" and 26".
If you're 23.5" or less, go with a Medium. If you're over 23.5" go with L.