Designed to help you survive the dog days of summer without drowning in your own sweat, the Hailey Tank is made of Ibex's lightest weight wool with a hint of nylon so it feels like wearing nothing. Combine the lightweight feel with wool's natural anti-stink properties and you've found a new workout favorite. The lightest weight Merino tank. Regular Fit. Scoop-neck henley with a buttoned placket. 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.