A Base Layer Like No Other - Performance Weight Heatwave top with built-in hinged headliner hood fuses three advanced fabrics, each tailored to specific body zones, providing you the ultimate balance of warmth, breathability, and moisture-wicking performance. The innovative headliner hood provides adaptable wear, effortlessly adjusting to changing weather conditions while ensuring both comfort and functionality. Features: Seirus Dual-Stage Heatwave Technology - Kinetic Stage Amplifies Temp by 4-5°, Reflective Stage Retains 20% More Warmth Engineered Body-Map Heatwave For Elevated Warmth Athletic Fit Built-In Hinged Headliner Hood 4-Way Stretch Spandex for Superior Shape, Flexibility, and Comfort Max Wick Fabric For Enhanced Breathability & Rapid Wicking Polygiene Antimicrobial Mesh with Ventilation Zones For Targeted Sweat and Odor Control (70% Recycled) Anti-Chafing Flatlock Seam Construction Raglan Sleeves for High-Performance Movement Reflective Details on Chest Your Warmest, Most Comfortable Base Layer Ever Seirus Women's Heatwave Body Mapped Base Layer Quick Hoodie Top