I did about three dives with the supplied harness, then ripped the lot off and fitted a 2 piece harness (kept the left shoulder break). Felt a lot better when I got rid of all the clutter. No need for the chest strap (I have arms to stop the shoulder straps falling off), no need for the crotch strap (I have a waist, I know some don't). TBH I wasn't that impressed with custom divers wing set up, but I got it for a reduced price. Certainly wouldn't pay full retail for one.