Generally speaking, it's a bad idea to toss bras in a washer and dryer on high heat. Ideally, they should be hand-washed. If that's too much hassle, one should at least put them in mesh lingerie bag so the straps don't get all tangled up with parts of the washer and other clothes, which tends to deform the straps. The hooks of a bra can also get caught on other clothing and damage the other clothing. Washing bras in hot water generally shortens their lifespan. A good bra can be quite pricey so some women who hand-wash nothing else do hand-wash their bras, especially if they are hard to fit.