Read: Your guide to the layering system / Ultimate walking essentials kit list
For multi-day treks, a merino wool t-shirt is a game-changer, with its natural odour-resistance and fantastic temperature regulation. If you’re pushing your limits, a lightweight synthetic Rab t-shirt offers amazing breathability to keep you cool. Many in the collection have built-in UPF sun protection, and all are cut for active use, with features like flatlock seams to prevent rubbing under your pack. This is the gear that will keep you going, no matter where the trail takes you.