The On Running Half-Zip Base Layer is a premium performance-oriented long-sleeve top designed for active lifestyles and layering. Featuring a sleek half-zip mock neck, raglan sleeves for enhanced mobility, and a minimalist aesthetic with the iconic On logo subtly embroidered on the left chest. Constructed from lightweight, moisture-wicking technical fabric, it offers excellent breathability, quick-dry properties, and odor resistance—ideal for running, training, or casual urban wear. The slim-fit silhouette ensures a modern, clean look without bulk, while flatlock seams prevent chafing during movement. Available in classic Black, Gray, and White, this versatile base layer transitions seamlessly from gym to street. Its refined construction and Swiss-engineered attention to detail reflect On’s commitment to functional elegance. Perfect for fall/winter layering or as a standalone piece in milder seasons, it suits daily wear, light sports, and smart-casual outings alike.