HerRoom Response: It is very important that bras not be put in the dryer. The casing covering the underwire can shrink and cause the underwire to poke out.
HerRoom Response: You are absolutely correct. When you put a bra in the dryer, it will usually shrink the casing around the wire and thus cause the wire to eventually poke through.
HerRoom Response: When wires poke through, this is usually associated with a few issues. The first is that this bra may have been put in the dryer with heat. The casing that covers the wires is usually cotton. The heat shrinks the casing and causes the wire to push though the fabric. The second issue could be your band is too loose. When a band is too loose, it moves about the body. This movement wears down the wire casing and can cause the wire to poke through. A third issue might be that the manufacturer simply did not sew enough stitches to close the casing channel. If this is the case, a quick alteration will fix this bra.
HerRoom Response: Generally, when wires begin to poke out it is because the band is not snug enough and allows the bra to mover around on one's body. This movement eventually causes the wire to poke through. Catherine's comment suggests that the band is fitting snuggly, however we would suggest Catherine go down a band size and up a cup size (to a 40E). This should stop the problem with the wire poking through.
HerRoom Response: This result can also be caused by purchasing a bra that is too small in the cups. Perhaps you need a larger cup size.