Saucony Impulse Crop Top The Impulse Crop Top Features A Cool, Nylon Fabric That Helps Provide Added Support, Comfort, And Great Moisture Management. The Strappy Back Design And Extended Length Allows This Piece Of Running Gear To Either Stand Alone, Or Be Layered Underneath Any Of Our Great Tops.Nylon 4-way Stretch FabricDual-layer Construction For A Compressive Fit And Light To Medium Impact Support (Best For A-c Cup Sizes)Strappy Back DesignRemovable Cups For Modesty And SupportAnti-microbial Treatment To Help Eliminate OdorReflective ElementsFabric Breakdown: Powertight (70% Recycled Polyester, 19% Polyester, 11% Spandex)Imported