• Classic Fit / Reversible w/ Reflective Hits At Chest & Legs • Lightweight Heatwave™ for All-Season Warmth & Rapid Wicking • Anti-Chafing Flatlock Seam Construction • Terry Backed elastic waist band for Comfortable Fit During Activities • 4-Way Stretch Moisture Control/Breathable Heatwave™ with Integrated Spandex for Improved Stretch, Shape, and Maximum Comfort • Ergonomically Placed Max Wick™ Fabric For Increased Breathability • Right side drop-in pocket providing convenient storage space for your phone, cash, cards, etc A thin base layer with ultimate warmth - the Heatwave™ All Season Bottom harnesses the amazing warming power of Seirus® exclusive Heatwave™ technology, now in an even lighter weight! The heat-reflective material amplifies 4-5 degrees while also reflecting 20% of your escaping body heat back to you. With brushed Max Wick™ next to skin for optimal wicking and ventilation throughout. By maintaining a warm core you increase blood flow, which also helps keep your extremities warm. SHOP OTHER BASE LAYER Men's All Season Top Women's All Season Top Women's All Season Bottoms Women's Winter Weight Top Women's Winter Weight Bottoms Men's Winter Weight Top Men's Winter Weight Bottoms Women's Mapped Top Women's Mapped Bottoms Women's Mapped ¼ Zip Mock Neck Top Men's Mapped Top Men's Mapped Bottoms Men's Mapped ¼ Zip Mock Neck Top