Measure the circumference of, or distance around, your wrist and add 1" or more for a comfortable fit. Measure carefully and leave enough room for comfort since these are not returnable.
Select your weave, from the examples shown below. The most flexible weaves are the TRILOBITE, CHECKER and the LIZARD. They are a bit wider, but lay flatter. The stiffest weaves are the DOUBLE COBRA and SAWTOOTH. The others are somewhere in between.