Fitted this into my Oxford Delta 1.0 Air Jacket. The back protector is fine but the closure on the jacket is badly thought out. There are two strips of Velcro sewn into the inside of the jacket liner (one on the top section & one on the bottom section) but no Velcro on the back protector. Result is that the jacket liner pocket tends to gape open and could be easily ripped apart when stuffing your arm into the wrong hole! Solution - I purchased some 1.5 inch Velcro strip from Amazon to do the job. This cinches the pocket shut. See photos