Unisex FR Jogger Sizing:

Eric is 5'9" 155lbs and wears a Medium

Size Waist Inseam
S 15" 2812"
M 16" 29"
L 17" 29"
XL 18" 30"
2XL 19" 31"

Waist - Measured with item flat and measured across the waistband from one side to another.
Inseam - Measure from the bottom crotch seam, down the inside of the leg to the leg opening.