Rails Alder Long Sleeve Shirt in Grey. - size S (also in L, M, XL/1X) Rails Alder Long Sleeve Shirt in Grey. - size S (also in L, M, XL/1X) 93% polyester 7%. Machine wash. Front button closure. Two chest pockets. Buttoned cuffs. Midweight flannel. RAIL-MS250. RM-591-946C-8403. Launched in 2006, Rails is a unique brand of fashion fusing California comfort activewear with European styling. High quality fabrics, narrow cuts, and unique lines; this collection is influenced by international travel and metropolitan lifestyle.