Days in the city can get just as cool as those in the wild. The TNF Denali men’s sleeveless vest is made of Polartec recycled polyester fleece, features a drawcord adjustable hem and offers a relaxed fit. Designed to enhance performance in a variety of environments, Polartec is an essential for experienced outdoor enthusiasts. Soft heavyweight fleece, the Polartec 300 provides a thermal layer to wear on very cold excursions. This garment can be worn alone or as a mid layer in a layering system providing comfort and warmth enabling you to regulate your body temperature by wicking moisture away during your outdoor activities. This onion layering system is made of three types of clothing. The first layer, worn next-to-skin will provide warmth and quickly move moisture away from your skin. Then, the second layer, is the insulation or fleece, that provides warmth while also dissipating heat during periods of high output. And finally, the third layer, the shell, which is the most weather-protective layer, worn on the outside of all other layers.