Sunny out? There's UV resistance. You're sweaty? There's sweat-wicking tech. On its own or worn as a layer, this ACG quarter-zip top has soft and stretchy fabric for a comfortable feel. Fit & Design: 1/4-Zip design lets you adjust coverage and airflow Wear this snug base layer on its own, or with a mid and outer layer when conditions call for it Thumbholes extend coverage and help keep your sleeves in place while you move Cool mesh underarm panels are breathable to help you stay comfy on the trail Technology: Nike Dri-FIT technology moves sweat away from your skin for quicker evaporation, helping you stay dry and comfortable Additional Details: This product provides UVA and UVB protection from the sun only in the areas covered by the garment