48% Polyester / 48% Recycled Polyester / 4% Elastane. Stretch. Swing Tech™. Jersey Fabrication. Ribbed Collar. Chevron Geometric Print. Sleeveless. Machine Wash. Opti-Dri™. Transfers moisture away from your body to keep you cool and dry. Swing Tech™. Made to maximize your range of motion on every swing, Swing Tech provides noticeably less restriction through re-engineered construction and materials.