All Threadborne technologies have one goal: push the limits of design & manufacturing to reach new levels of comfort & performance. The Under Armour Men's Threadborne™ Siro 1/4 Zip Long Sleeve Shirt is built with Threadborne Siro technology, where the fabric is super lightweight, won’t cling to you, won’t chafe & dries incredibly fast.
Threadborne™ Siro: Super-light, dries incredibly fast & won't cling to you.
- Threadborne Siro fabric feels insanely soft, is extremely light & dries incredibly fast
- Anti-odor technology prevents the growth of odor-causing microbes