Not every sweatshirt is built the same way, and the difference matters once you start using one for actual training instead of just lounging around. A cotton crewneck that feels great on the couch can turn into a heavy, damp weight halfway through a run. Picking the right piece, whether it is a well-known option like a Nike sweatshirt or something from a smaller athletic brand, comes down to understanding what the fabric and cut are actually designed to do. What Makes a Sweatshirt Athletic in the First Place An athletic sweatshirt is built around moisture management rather than just…