These arm guards are so easy to use! Just slip it on!
Includes a thick,padded strip for protection.
It can go on your bare arm, or pull it on over your shirt sleeve.
The widths are tapered and, before stretching, are as follows:

sm 3 1/4"at the small end to 4 " at the larger end
med 3 3/4" to 4 1/2"
lg 3 7/8" to 4 3/4"
xlg 4" to 5"

lengths
sm 6 3/4"
med 7 3/4"
lg 8 3/4"
xlg 9 3/4"