Hot Chillys Men's F9 Endurance 8K Tights 89% Polyester/11% Spandex Imported Articulated construction and Four-Way stretch Mtf (moisture transfer fiber) wicks energy-sapping perspiration Variable weight insulating properties STAY WARM - Base layers are an important part of your winter sports gear, designed to help you maintain your body's optimum temperature, no matter the conditions. Hot Chilly's Factor 9 series is created from a blend of 3 mountain-weight fabrics for an overall warmth factor rating of 9, meaning you'll stay nice and warm even in the most extreme conditions. COMFORT - Hot Chilly's Factor 9 is soft and breathable, making it incredibly comfortable to wear under all your other layers. The MTF, or Moisture Transfer Fiber, panels are placed in sensitive areas to keep you dry, while the Bio-Silver odor neutralizing properties inhibit bacterial growth, to keep you fresh all day long. FIT - The best performance base layers are the ones that provide high-quality protection without being too restrictive. The Factor 9 performance base layers feature an anatomically based design that features 4 way stretch, moving with you, leaving your performance unhindered so you can hit the slopes hard. The close-fit design also lets this layer fit better under or over other Mid or performance base layers, without feeling too heavy or bulky. USE - No matter what your sport, be it snowboarding, skiing, snow shoeing or climbing, the use of base layers is essential if you spend any significant time outdoors. Hot Chillys has created state-of-the-art layering garments that help you be adaptable to every changing circumstances, keeping you comfortable so you can focus on having fun. SIZING & CARE INFORMATION - Multiple sizes available; Machine wash in cold water on the delicate cycle. Tumble dry on low and remove promptly. Do not bleach or iron.