Polartec has launched an innovative and functional brand of apparel, called MtnLogic, in partnership with Peter Whittaker, the well-known mountain climber and guide who owns Rainier Mountaineering (RMI), the largest guide service in the U.S. The line is being presented at the current Outdoor Retailer Winter Show. It will be available to consumers from April 15 on MtnLogic's website and at the Whittaker Mountaineering store at the base of Mount Rainier.