We combined the natural benefits of ZQ-certified Merino wool (moisture management, temperature regulation, and odor control) with the quick dry times of polyester to create Sport 150 fabric, which is perfect for high-sweat, high-energy activities. On our Women's Merino Sport Tank, we've added mesh in strategic areas to improve breathability and designed the top for freedom of movement and comfort. For anything from a HIIT workout to a training run, this tank can help you feel good.