#1 selling technology in glove liners, now available for your whole body • Classic Fit / Reversible • Heatwave™ for More Warmth & Rapid Wicking • Anti-Chafing Flatlock Seam Construction • Polygiene® Mesh Anti-Microbial Ventilation Zones • Raglan Sleeves for Comfortable Fit During Activities • Reflective Hits at Chest • 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 • High-Performance Power Mesh for Increased Breathablilty at Perspiration Zones A thin base layer with ultimate warmth - the Heatwave™ reversible top harnesses the amazing warming power of Seirus® exclusive Heatwave™ technology. 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 Winter Weight Bottoms Women's Winter Weight Top Women's Winter Weight Bottoms Men's Mapped Top Men's Mapped Bottoms Men's Mapped ¼ Zip Mock Neck Top Women's Mapped Top Women's Mapped ¼ Zip Mock Neck Top Women's Mapped Bottoms Men's All Season Top Men's All Season Bottoms Women's All Season Top Women's All Season Bottoms