Rails Oliver Pants in Navy. - size M (also in L, S, XL/1X) Rails Oliver Pants in Navy. - size M (also in L, S, XL/1X) 53% polyester 43% rayon 4% spandex. Machine wash. Zip fly and button closure. 4-pocket styling. Lightweight suiting fabric. Opening measures approx 15. RAIL-MP34. RM-502A-985E-005. 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.