Less Sweat Nike Dri-FIT ADV technology combines moisture-wicking fabric with advanced engineering and features to help you stay dry and comfortable. Layer and Adapt ACG apparel is designed as a nesting system, so you can adapt and adjust to the climate around you. This top is made to wear as an only layer or first layer. Go with your normal size for layering. If you want a trimmer fit, we recommend sizing down. Designed to feel relaxed through the shoulders, chest and body for an athletic fit you can layer over. Paneled sides and underarms are there top help you move with less restriction.