Effortless style meets lightweight, go-anywhere performance in this L.L.Bean™ Mountainside Shirt Short Sleeve. Mountainside Shirt Short Sleeve. This ultra-breathable woven shirt is designed to fit and flatter from backyard to trail to town. Our Mountainside Collection takes town-to-trail versatility to a whole new level. We combined performance-rich fabrics with classic, everyday styling so no matter where you go, you're always comfortable and always ready for adventure. Made from soft, quick-drying, moisture-absorbing, and abrasion-resistant fabric for comfort on the go.