Strap Free Silicone Adhesive Bra. RkBra gives your breast a fuller look due to the thicker silicone gel padding. This is not just another backless and strapless bra. Our silicone bra is a revolutionary invention that answers many women prayers. Featuring two silicone bra cups, special reusable adhesive backing plus a front closure give you freedom and comfort from the absence of bra straps and side extension. To apply, simply position bra on the desired area, press on and go. The state-of-the-art adhesive is lab tested and proven to be skin friendly.