Lightweight and warm trekking shirt with a wide fit. Made of functional polyester flannel which provides excellent insulation, expels moisture and dries quickly. Long-sleeve shirt with button-down collar in functional polyester flannel. Two breast pockets, one with a flap and the other with a zip. This means the shirt is ideal for activities such as hiking and skiing, both as a base layer closest to the body and as a warm mid layer worn over under garments.