The Retainer Band is designed to be work over top of the Innerwear sheath. If you find it to be too loose you can wear the spandex sleeves underneath as well. There is also plenty of room for customizing the fit using the accessories. For example you can put as many layers of spandex sleeve as you like 2, 3 or even 4 1cm layers at the base to create a tighter fitting Retainer Band. If that doesn’t suit you let us know at the support email to see about getting a proper fitting RB.