I find if you have one breast removed using the prosthetics do feel heavy. I have had a double mastectomy and I don't notice them being heavy since they are both same weight. I have ordered a set of the knitted knockers but haven't received them yet, am anxious to get them. A friend has a set and says they are wonderful, keep up the good work ladies you are appreciated very much, especially women that are on a tight budget. Very wonderful project. I sew but don't knit or I would make them too.