I fluxuate between a b and a c cup, and these worked perfectly for me. I know other reviewers have said the cups were too small, but everything stayed in these fine, on both ends of my scale. These not having wires, the only thing I could suggest to someone who had that problem is to double-check the strap length, as, without much support from below, you might get a better fit if the straps are pulled a bit shorter to keep the balance the wires would normally provide.
 I wasn't expecting support, or I would have bought something with wires, but these provided more support than I'd expected. Comfy, relaxed, and not too much drama, they're great for an easy day in clothes I don't need cleavage in, or just something to make things less jiggly in pajamas or sweats.