Wearable Silicone Breast Forms | Halter Strap | C–G CupWear Them. Own the Room. These wearable silicone breast forms come with a built in halter strap so you can wear them directly no bra required, no harness needed. Made from medical grade silicone, they deliver a natural look and feel that moves with you through every performance. Choose your cup size (C through G), your fill type (cotton for lightweight comfort or gel for maximum realism), and your skin tone. Available in three skin tones and eight