Helly Hansen VTR Mesh Short Sleeve Running T-Shirt X-Cool Quick Dry Fabric - For super quick drying next to skin, X-Cool quickly moves away moisture to keep you dry and comfortable. Full Mesh Back and Arms - Increases the braetahbility and ventilation whilst also being fast drying, keeping you cool, dry comfortable. UV Protection 40 - Provides protection against the sun, letting you train with confidence.