Matt wears Icebreaker's Merino 200 Oasis Beanie when it's cold: 100% merino, 40 grams, with a double layer over the ears, for $30.

Matt's base layer is Icebreaker's Merino 200 Oasis Long Sleeve Crewe: 100% merino in a slim fit, with the shoulder seams moved off the top of the shoulder, for $120.