Duofold by Champion THERMatrix Long Sleeved Crewneck Activewear Base-layer Top / Shirt in the color underwater blue, size Small. Varitherm base layer long sleeve crew features champion vapor technology, quick drying for superior comfort. Stretch for easy movement. Excellent moisture management. Gently pre-owned with just a few small pulls in the fabric. Approximate measurements taken laying flat include 25 inches in total length and 16.5 inches from armpit to armpit.