We love this product! Perfect to wear under more sheer or clingy apparel and costuming. Self-adhesive and reusable, these nipple covers are perfectly shaped and contoured to conceal nipples and stay on. Perfect for wearing under sport bra tops, sheer bra tops, bathing suits, sweaters and t-shirts. No more uncomfortable tape or irritating adhesive! Washable and re-usable. 2.5", 6.35 cm diameter.