The Basel fabric has to be touched to be believed. Extraordinarily soft, powerfully durable and altogether wonderful to wear, it's made from a blend of 95% micromodal (made from sustainably forested beech trees) — the result of countless tests and sampling exercises by our fabric technicians.Suitable for sleeping, lounging or outdoor layering, there's not much this T-shirt can't do. Because of the thermostatic qualities of the fabric (the weave responds to ambient temperature to offer more insulation when it's cooler), it's also great for sports. And a long-haul flight is a lot more bearable if you're wearing super-soft Basel.