Functional, lightweight base layer is soft, stretchy, and warm Engineered with Kwikwarm™ technology; volcanic ash particles are blended with carbonized natural plant fibers to create a fabric that collects and stores heat from the body, keeping skin warm through contact Quick drying, naturally deodorant, and permanently antimicrobial Subtle stripe design with contrast flat-seam construction for fun, flattering and comfortable layering Four-way stretch integrity moves with you and has excellent shape retention Coolpass™ panels are strategically placed in high-sweat zones at back and under arms for optimal moisture management Body hugging, athletic fit Running horse graphic across upper back Wash cold, tumble dry low