Finding your correct size:
Standing straight, take a tailor's tape and measure the circumference at the fullest part of your chest by wrapping it around your torso, underneath your arms and across your shoulder blades. This chest measurement will be your size. You will want to add 1” for any bulky layers.
SIZE:
Regular: 23" up to 42"XL: 40" up to 62"
How to fit:
Start by loosening the straps on the harness before putting it on. Tighten the straps around the body and then the shoulder. The harness should fit around the body, snug but not tight. The shoulder straps are meant to be comfortable, and the padded portion of the straps is entirely over your shoulder and not digging in. Tuck excess straps in the elastic holder.