I’m a big fan of casual Japanese highstreet brand Uniqlo’s HeatTech range. They sell everything from camisoles to leggings and long-sleeved shirts made from this special material that keeps you warm. Apparently the magic material also absorbs body moisture (aka sweat) and transforms it into heat. Or something like that.
Bottom line is: the fabric is comfy and soft like a baby’s bottom and doesn’t feel synthetic at all. Plus you can wash it like a 1000 times without it turning grey and boring (as cotton does).
They also do a range of very cheap cashmere/wool sweaters for men (and women) in many different colours. At 24.99 you’re not going to cry if: a) you find out that a hungry moth has taken a big bite of it or b) you accidentally wash it on 60 degrees. Not that any of those things have ever happened to me, no no of course not 😉