Trulife 477 SILK flex breast form is a symmetrical heart-shaped breast form that fits well with underwire bra styles. It can be positioned in any direction for best fit. SILK defines what a breast form should be; soft and natural. A new innovative skin is silky-soft and offers unparallel softness and suppleness. All SILK forms offer a natural drape not found with other breast prosthesis. Natural coloured pigment produces a colour that blends well with various skin tones. Fit: Average to Full. Sizes: 1-14.(See Trulife Naturalwear's breast forms sizing chart).