Retainer
The function of a foreskin retainer is to keep the glans penis covered by the available foreskin. A foreskin retainer can be used when newly grown foreskin is neither long enough nor tight enough to keep the glans covered itself, but is long enough that it can be stretched past the glans (which is necessary to facilitate the use of a retainer). Rubber bands, o-rings and cones with both ends open can be used as retainers.
The foreskin can also be retained with a medical adhesive, known as MRS. MRS is a silicone based skin safe adhesive. MRS originally stood for Miracle Restoration Spray, but is now available in a brushable form. A small amount of adhesive is applied to the glans, and the skin is rolled up and retained by the MRS. MRS sets up almost instantly, but the skin can still be pulled back if necessary.
Read more about this topic: Restoration Device