Helly Hansen Pace Half Zip Lifa Flow Short Sleeve Shirt Lifa Flow - For super quick drying next to skin, Lifa Flow quickly moves away moisture to keep you dry and comfortable. Quick Dry Mesh - On the rear panel and under the arms, delivers increased air flow in key zones. 360 Degree Reflectivity - Increases the visibility of the wearer in low level lighting conditions. YKK Chest zip with Autolock - Secures the lock in place when no in use. Flatlock Stitching - Eliminates Skin irritation and potential chafing.