Rails Oslo Sweater in Grey. - size XS (also in L,M,S) Rails Oslo Sweater in Grey. - size XS (also in L,M,S) 42% alpaca 42% wool 14% polyamide 2% elastane. Dry clean only. Front button closure. Front slip pockets. Imported. RAIL-WK58. 843-365-2214. 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.