Made out of Bamboo, think of it as a natural fiber fabric for Tech shirts. Providing protection without overheating, Bamboo is great for layering. Looks and feels like the softest of cottons- perfect for training or racing! These tech shirts are UNISEX; great for men and women! Our Short Sleeve Tech Shirt was and continues to be designed for use IN THE BOAT: - Shorter front to eliminate extra fabric at your belly in the boat. - Long tail to cover you whole back at the catch. - Snug-fit to bring out the technical properties of the fabrics, maximizing wicking and insulation. - Fits beneath your unisuit for superb training or race day layering.