The Essential Rib. Updated with thinner straps, our ribbed tank top is made from the finest cotton. Slim fit. Size Small: centre back length 18", chest 23", sweep 23 1/2". Model is 5'10.5" wearing a size small. 95% Organic Pima Cotton 5% Spandex. Machine wash cold with like colours gentle cycle, do not bleach or tumble dry, lay flat to dry, cool iron if needed. Made in Peru. Colour: brown