These Dolfin polyester swimsuits are very long-lasting.  They don't deteriorate (youve seen the suits where the black becomes more transparent and black begins to look gray - thats not a Dolfin polyester suit) or stretch out of shape from chlorine.  They are very comfortable to wear.  Its a nice feature that these suits are also fully lined too.  This is probably the fourth dolphin swimsuit Ive purchased, not because the others have stretched out or become unwearable, but because I like to switch them up.  Even after a years thrice weekly wear at a chlorinated pool, they still look like new.