Features of the Marmot Women's Solstice Tank Midweight, durable, breathable, quick-drying Performance fabric Nanowick Technology for enhanced wicking Ultraviolet protection factor (UPF) 50 Stretch for increased mobility 3-piece internal shelf bra Lightweight padding for modesty and support Racerback detail with open back Straight bottom Fabric Details 92% Polyester, 8% Elastane single jersey 6.8 oz/yd