The idea is you can use it immediately post-surgery (because it is so soft & light) and then once you are healed you can replace the fibrefil with the beads. Then as it is filled with beads it has all the same features as the Ajust-A-BAB. The Been-A-Boob is a unique breast prosthesis / breast form which is made of soft fabric with a special filling which imitates a natural breast. It is lightweight, comfortable and cool. It will fit into any regular mastectomy bra, swimsuit, and janac sport tops. After surgery many women find their chest area is uneven. The Been-A-Boob breast form will fill in those areas and help to make them look like they did before their surgery. Thus, whether you are running a marathon, participating in an exercise class, or working around the house, nobody will know you are wearing a prosthesis. PLEASE NOTE: SIZES ARE GENERALLY 2 SIZES BELOW THE SILICONE PROSTHESES, THEREFORE, IF YOU ARE WEARING A SIZE 8 SILICONE, THEN OUR SIZE 6 WILL PROBABLY BE THE EQUIVALENT. MAKE SURE YOU CHECK OUR FITTING GUIDE FOR THE CORRECT SIZE TO ORDER, OR CONTACT US FOR HELP.