Sunny out? There's UV resistance. You're sweaty? There's sweat-wicking tech. On its own or worn as a layer, this top has soft and stretchy fabric for a comfortable feel. Fit & Design: Slim fit: sleek and tailored Mesh panel in underarm Thumbholes help keep your sleeves in place Wear this snug base layer on its own, or with a mid and outer layer when conditions call for it Technology: Nike Dri-FIT technology moves sweat away from your skin for quicker evaporation, helping you stay dry and comfortable Additional Details: Made from recycled materials ACG apparel is designed as a nesting system so you can adjust to your climate and activity level This product provides UVA and UVB protection from the sun only in the areas covered by the garment