A technical zip-neck for warm weather trail running, the Accelero leverages two distinct performance fabrics to deliver optimal comfort and thermoregulation. Air permeable Helius on the front wicks away moisture and offers UPF 50+ sun protection. Smooth on the skin, it helps prevent chafing on long runs. On the back and shoulders, Viente mesh is used for increased airflow and cooling comfort. Composite Mapping technology is used to precisely place each fabric to maximize their benefits.