Champion Big & Tall Men's Powertrain Vapor Tech Athletic T-Shirt Big & Tall Men's PowerTrain Tech AthleticT-Shirt with moisture-wicking Vapor technology Brand: Champion - Authentic Athletic Apparel for Big & Tall. Outfitting athletes for over 90 years. Fabric:100% Polyester - Light weight. Fabric is tightly woven and has a dull shine in appearance. New - All retail tags attached See Hand Measurements chart in photo gallery for measurements of each size.