A BASE LAYER LIKE NO OTHER - The Performance Weight Heatwave™ Top With Zip Up Mock Turtleneck Warms Your Core While Perfectly Managing Ventilation and Perspiration • Seirus® Exclusive Dual-Stage Heatwave™ Technology - Kinetic Stage Amplifies Temp. 4-5°, Reflective Stage Returns 20% More Warmth • Athletic Fit • Mock Neck with 1/4 zip • 4-Way Stretch Moisture Control/Breathable Heatwave™ with Integrated Spandex for Improved Fit, Shape, and Maximum Comfort • Ergonomically Placed Max Wick™ Fabric For Increased Breathability • Engineered Body-Map Heatwave™ For More Warmth & Rapid Wicking • Polygiene® Mesh Anti-Microbial Ventilation Zones For Focused Perspiration Evaporation • High-Performance Anti-Microbial Mesh at Perspiration Zones for Micro-Biome Balance & Odor Control • Anti-Chafing Flatlock Seam Construction • Raglan Sleeves for Comfortable Fit During Activities • Reflective Hits at Chest • The Warmest, Most Comfortable Base Layer SHOP OTHER BASE LAYER Men's Mapped ¼ Zip Mock Neck Top Men's Mapped Top Men's Mapped Bottoms Women's Mapped Top Women's Mapped Bottoms Men's Winter Weight Bottoms Women's Winter Weight Top Women's Winter Weight Bottoms Men's All Season Top Men's All Season Bottoms Women's All Season Top Women's All Season Bottoms