The Arc'teryx Velox Comp Sleeveless is a warm weather training top that incorporates the ultra-breathability of Libro fabric on the main body and pairs it with the super wicking Vivital fabric on the side panels. Lightweight and cool feeling, these sleeveless tops are like wearing nothing at all. Arc'teryx Velox Comp Sleeveless Features: Highly breathableLightweightFlatlocked seamsV-neckNon-chafing heat transfer labelReflective logo