The ScuttleButt is designed to be used with most leg-loops-and-waistbelt-style adjustable leg loop harness. Sleeves allow the leg loops to be slid into place. A gap in the sewing allows the holdup strap to be pulled through and used like regular. In the new version, the whole waistbelt slides into a welded sleeve, with a gap at center for the back hold up straps to be reattached, though they are not needed. For the ScuttleButt to work, the leg loops of your harness must open fully, so they can be pulled through the sleeves.