Cool-weather training calls for a layer that delivers warmth without sacrificing performance. This half-zip top is designed to provide lightweight insulation for running, warm-ups, and outdoor activities. Featuring NB HEAT technology, it helps retain body warmth while efficiently wicking away moisture, keeping you comfortable as your effort level increases. The soft Heat Grid fabric enhances warmth while maintaining a comfortable feel against the skin and supporting temperature regulation throughout your workout. Its slim fit follows the body's natural shape, reducing distractions and allowing unrestricted movement. Long sleeves feature integrated fold-over mittens at the cuffs, providing extra coverage when temperatures drop. A secure zip storage pocket offers convenient space for small essentials such as keys or cards without interfering with performance. Reflective details, including the Flying NB logo on the chest, help improve visibility in low-light conditions. Made with recycled polyester and elastane, the fabric delivers stretch, comfort, and durability in a lightweight construction. Whether you're logging miles, training outdoors, or staying active during cooler days, this versatile layer provides the warmth and functionality needed to perform with confidence.