Hollywood Fashion Secrets Silicone Cover-Ups: self-adhesive, hypoallergenic and comfortable nipple covers. The contour shape boasts a perfectly engineered tapered edge to give you that ultra-smooth appearance. Silicone Cover-Ups are discreet and conceal when you don’t want to reveal. Perfect for sheer tops, dresses, t-shirts, braless fashions, and swimwear. Wear with or without a bra anytime.