New Balance Seamless X4J Asym Shirt. The New Balance Seamless X4J Asym Shirt features dynamic and adaptive fit depending on your dominant arm. It’s engineered for breathability and support, with NB FlexX premium 3D stretch fabric. Features: 96% Nylon, 7% Spandex Dynamic stretch and adaptive fit Made for dominant arm Engineered for breathability and support where its needed Seamless body construction NB FlexX NB Dry
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