This best-seller is now enhanced with even lighter fabric pieced with mesh for breathability. Ultra-durable FlashDry-XD„ keeps you dry by wicking moisture away from your skin. Keep going for longer when the heat is on with UPF 50 that doesn't need topping up. WICKING: Quick-drying fabric moves moisture to the surface to evaporate. UPF PROTECTION: This fabric repels direct sunlight to protect your skin. Fabric: body | 136 g/m² 100% polyester with FlashDry-XD„ Fabric:  knit mesh | 140 g/m² 76% nylon, 12% elastane, 12% polyester Standard fit Lightweight quarter zip Breathable piecing at underarms and cuffs Wicking Anti-odor Ultraviolet Protection Factor (UPF) 50 Reflective logo on left chest We say - The Ultraviolet Protection Factor (UPF) rating system measures the UV protection provided by fabric. UPF protection is essential for garments that are designed to be used for long periods in direct sunlight, as overexposure to UV radiation can have adverse effects on the skin. A UV rating of 50 or above is noted as excellent.