Supple Cups have been designed to help address flat, shy and inverted nipples, which collectively affects 28-35% of women who are pregnant for the first time. *Supple Cups are clinically proven: The Use of Supple Cups for Flat, Retracting, and Inverted Nipples, Julie Bouchet-Horwitz, Clinical Lactation, Volume 2, Number 3, 2011, pp. 30-33(4). S..