Ultra lightweight, fast-drying, high wicking base layer. A great technical layer for any outdoor pursuits. Made from from highly breathable ISOVAPO fine polyester mesh fabric with lightly perforated venting zones under the arms and across the back. The featherweight construction provides exceptional comfort in warm conditions. Cut with offset shoulder seams to sit smoothly under rucksack straps and a longer hem at the back for additional coverage. The low pack weight is ideal for longer trips. With the signature R on the left sleeve.