Spanx Longline Sports Bra Size XS Medium Support for moderately-intense workouts. Breathable, sweat-wicking and quick-drying fabric Sleek racerback design for a distraction-free workout Soft, brushed elastic for comfort Under-bust band prevents rolling and digging in Chlorine and saltwater resistant & UPF 50 - wear from gym to swim! • Body: 68% Nylon, 32% Elastane. Bust Lining: 93% Polyester, 7% Elastane. Mesh: 75% Nylon, 25% Elastane. Machine Wash Cold.