Start simple. When it comes to your layering system, these bottoms offer a thin, stretchy base that effortlessly fits under midlayer and shell garments. 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.. . Made out of 100% polyester. Polartec(R) Power Dry(R) uses bi-component fabric construction to release vapors and control 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. Polygiene(R) antimicrobial technology controls odors to keep you feeling fresh. Made with Repreve(R) recycled yarns, designed to conserve energy and reduce CO2 emissions. Quick-dry construction assists with controlling moisture, moving it to the fabric