Simplicity, Versatility And Performance Make The A4b T-shirt A Key Piece For Bike Commuters. The Lightweight, Comfortable Polylain™ Wool Blend Fabric Gives It A Durable, Naturally Odour Resistant Performance With A Look That Works With The Urban Dress Code. Designed Specifically For The Motion And Dynamics Of City Cycling, The Ergonomic Patterning, Longer-length, And Streamlined Trim Fit Move With The Body And Layer Easily Under A Button-down Or Sweater.