On Running's Running-T PAF is a lightweight performance tee from the On x Post Archive Faction collaboration, built for running and everyday wear. It focuses on moisture management and targeted ventilation to keep you dry and comfortable during high-intensity activity. Key attributes: Black | Czarny | Polyester | Moisture-wicking | Quick-drying | Breathable fabric | Ultra-lightweight | Mesh inserts and side gusset for ventilation | Integrated back slit for added airflow | Bonded back panel for streamlined silhouette | Reflective detailing for low-light visibility | Durable riveted finishes | Subtle chest print | Back slit for airflow | Bonded back panel | Reflective dot pattern | Mesh inserts and side gusset | Dimensions & fit: Relaxed fit | Unisex sizing — recommend women size down | Composition & care: 100% polyester