Start simple. When it comes to your layering system, these bottoms offer a more substantial yet stretchy base that effortlessly fits under midlayer and shell garments for skiing, hiking, snowshoeing, and other cold-weather adventures. Once there, it delivers several crucial components for comfort in the outdoors: Moisture-wicking, quick-drying fabric evaporates perspiration, so you can keep trudging ahead without soggy, chafing, or bunched-up undergarments, while UV protection and flatlock seams help reduce sunburns and irritation.. . Fabric: 100% polyester jersey mesh blend. Bi-component material releases vapors and controls moisture, resulting in a fast-drying, breathable, and lightweight material. Techwick(R) material controls moisture, pulling perspiration away from your skin, so that you remain dry, and offers antimicrobial properties to block the growth of odor-causing bacteria. Quick-dry construction assists with controlling moisture, moving it to the fabric