Arcteryx A2B T-Shirt - Men's Polylain - 58% Polyester, 42% Wool; Diem - 100% Polyester Polylain merino blend knit fabric is lightweight, durable, and contains the natural anti-odour properties of wool Redesigned with simplified styling, the T-Shirt still combines a trim fit and generous length, ideal for bike commutes or everyday activities Merino wool helps keep things comfortable across a wide temperature range and even provides some anti-odour properties