Shop Haider Ackermann Ribbed-knit Tank Top In White from 800+ stores, starting at $355. Your clothes are only as good as the pieces you wear under them - the right base layer can affect the way something fits and lays. Haider Ackermann 's slightly elongated tank top has a natural stretch and is blended with cashmere for softness. Wear it beneath a shirt or jacket. Shown here with Haider Ackermann hoodie, Haider Ackermann trousers, Saint Laurent boots. - - White ribbed-knit - Crew neck - 60% rayon, 35% nylon, 5% cashmere - Machine wash