In reply to elliot.baker:
I've got direct experience of this, as been in exactly the same position.
I ordered their merino hooded top, although actually wanted it as a lightweight jumper, rather than as a base layer, and also their long sleeve zip neck top - couple of each in different colours, iirc
The zip neck top fit me a treat, so kept that - the hoodie was a bit of an odd fit on me, even though the same size, and looked weird as a result, so got sent back. Also decided the hood might be a bit of a pain on a base layer
I'm very happy with the zip neck top.
I'll maybe order the hoodie again next time I put an order in with them, to see if I just got an odd one/they've altered the shape.