Lying flat unstretched on the table, the width of the top/bicep end and then the length:
XS - 4 1/8" wide and 17" long
S - 4 1/2" and 17 1/4"
M - 5" and 18 1/8"
L - 5 3/8" and 18 3/8"
XL - 6 and 18 3/8"
The fabric is a nice thick lycra with a fuzzy interior. Should be really nice for the coming colder weather.
Just found a post by Trek that she thinks they run a tad small. Trek, you still want a pair? Don't have you down as part of the original list. I must have missed your email. So sorry.