Under Armour Women's Sunblock 30 Half-Sleeve T-Shirt The lightweight, super breathable construction of the Under Armour Women's Sunblock 30 Half-Sleeve T-Shirt delivers subtly sheer coverage. The top provides UPF 30+ sun protection, and the Signature Moisture Transport System wicks away moisture to keep you dry and light. Additional features: Polyester/elastane Lightweight, four-way stretch construction improves mobility and maintains shape Anti-microbial technology keeps your gear fresher, longer Half-sleeve design for extra coverage Center-back seam detailUnder Armour