the luon has four-way stretch so it moves with you no matter where you go go ahead and sweat in it - this jacket is moisture-wicking zipper garage helps keep your chin from getting chafed plenty of pocket space for cash, keys and phone chafe-resistant flat seams won't rub you the wrong way durable and preshrunk so there are no surprises when it's laundry time Tech specs designed for: to-and-from fabric(s): luon® properties: chafe-resistant, breathable, four-way stretch fit: slim length: hip N-003