A training partner that won't let you down, the W2 Sport Tank is hard working and durable. Made of Ibex's lightest weight Merino wool blended with just a touch of nylon, this racerback tank is designed to move, stretch, and flow with you. The lightest weight Merino Tank. Semi-Fit. Contrast color blocking on side panels. Racerback design. Tag-free label. A nylon core is wrapped with wool to create a hardy fiber without bulk or weight. Weightless Wool is designed to be softer, more durable and lighter than synthetic workout fabrics. A perfect fabric when used alone for warmer days of aerobic work or layered to add warmth in colder activity. 145g/m2. 87% Merino, 13% Nylon.