Flight Arm Covers. Flight Series™ is our premier trail running collection. A handy new addition to this collection, are the Arm Covers. Pull them out for a little extra protection when the temp drops or when the sun is shining with full force. • Fabric | 85% recycled polyester, 15% elastane with FlashDry™. • Stretch adhesive at wrist and bicep so cover stays in place • Heat transfer “L” and “R” on each so you can distinguish left arm from right • Reflective, screen-printed TNF™ and Flight Series™ logos for enhanced visibility. FLASHDRY™. FlashDry™ fabrics are engineered to wick moisture away from your skin helping to keep you dry, cool and comfortable.