Nike Strike VaporKnit Short Sleeve Training Top. Lightweight; high performance training top from Nike.Features Nike\'s new VaporKnit technology. VaporKnit materials are quick-drying with a precision fit. High stretch yarn is lightweight with cooling zones that increase airflow.The text ured design is created for a body in constant motion; with a knit material that moves with you; while still providing a locked-in feel. 100% polyester.