The best mountain bike jersey for hot conditions. On hot and humid days, you need an MTB jersey that works as hard as you do. The Flexair Delta™ Jersey improves riding during the warmer months using Polartec® Delta™ fabric - an innovative fabric that acts like mini radiators to keep you cooler, drier, and comfortable. The jersey has a contoured fit with 4-way stretch for maximum mobility. A densely knitted sleeve provides abrasion resistance in key areas, making the Flexair Delta one of the most versatile jerseys in our line. Polartec® Delta™ cooling technology Rapid wicking and fast drying Densely knit sleeve is close fitting and provides added abrasion resistance Bonded cuffs and collar for complete comfort Mountain bike specific tailoring Drop tail back panel for bike-specific coverage Length (HPS): 31", size large MATERIALS 51% polyester, 45% rayon, 4% elastane