This is not a blend. An alpaca's coat provides superior performance in dense climates, for every season. The Alpaca Sweater is ultimately resistant to humidity and chill – a quality that can't be replicated with other yarns. Superfine alpaca wool is at least 50% softer than traditional wool due to its smoother individual strands. Knit together by a familiar shaker stitch, this sweater is an excellent insulator with each rib blending into a plush hand. Please be aware of a .5" tolerance for slight variations from garment to garment. SIZE Sleeve P2P HPS to Hem Small 23.25'' 21.75'' 27.5'' Medium 23.75'' 22.5'' 28'' Large 24'' 23.25'' 28.5'' Extra Large 24.25'' 25'' 29''