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The popular plus sized sports bras shown above are from the ENELL line of sports bras. They are made from NATUREXX, which consists of 90% nylon and 10% Lycra fabric.
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Personally I prefer sports bras made of at least 90% cotton. The one shown here is a full support cotton sports bra made by Grenier. But maybe that's because I haven't tried the high-tech new material bras yet. These materials promise to wick away moisture and keep you dry during workouts. They also supply significantly more support than cotton bras can.