Ibex Merino Wool Men's Woolies 1 Crew Shirt 86% Merino Wool/14% Nylon Imported Lightweight Merino rib-knit baselayer top Back length from top of shoulder = 29 inch (size L) Flatlock seams, tag free label The 18.5 superfine wool yarn offers a warm, close-to-the-body fit that moves with you and keeps its shape This award-winning, guide-approved ribbed fabric feels luxurious yet holds up in most rigorous conditions He Rib construction provides space for air permeability contributing to superior performance and excellent stretch and recovery Machine washable. 100% Merino wool