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Performance Button Down Shirt - Callum Sulphur Yellow like an integrated raincover thatOur Everyday Performance button downs are designed to infuse athletic benefits into your go to shirts. With a wrinkle resistant nylon, Coolmax and bamboo blend that wicks moisture, breathes well and stretches, this shirt ensures you'll always look and feel your best. johnnie O Performance Button Down Shirt Callum in Blue Size: Medium.