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Product DescriptionThe Powertrain Sleeveless Muscle Shirt dries faster the more your body heat rises. Super-soft, lightweight wicking fabric construction is lightweight for comfort no matter how vigorously you work out. Flatlock seams for style and comfort. Vapor back neck tape. Vapor external ID. Mesh inserts for ventilation. Vapor Technology for maximum cooling comfort. 100% polyester construction. The Powertrain Muscle Shirt moves with you, not against you.