PGA Tour Men's Airflux Polos

Can someone help me interpret the size chart on the specs tab? No M, L, XL, etc. listed but rather numbers in whole and half sizes. ??

Hang on. We’re looking for the correct size chart! Sorry!

Update: New size chart added.

how long are those shirts?

44"chest for a 2XLseems a little crazy. usually a L does it. are you sure?