Arc'teryx Men's SL Cotton Bird Word Short Sleeved T Shirt Alpine Blue Stone Red 2008 Tiffin Phaeton RV Specs Guide. Designed to deliver articulated comfort with gusseted underarms and continuous seam construction to eliminate binds, the Kragg SL Bird Word Short Sleeve T Shirt from Arcteryx, earns itself workhorse status. Heavyweight combed cotton handles beautifully, while boasting technical breathability and a casual, relaxed fit amplifies freedom of movement. 100% cotton Continuous seam construction Gusseted underarms Chest embroidery Relaxed fit, choose your usual size