HELLY HANSEN LIFA CREW THERMAL BASELAYER WOMEN’S

£35, hellyhansen.com (available in men’s)

You shouldn’t be mountaineering in an old cotton t-shirt – instead you need a technical, fast-wicking and warming layer against your skin. One of the best options is the iconic LIFA Crew from Helly Hansen, a distinctivelystriped baselayer that’s ultralight, breathable, stretchy, quick-drying and super comfy. For extra cosiness, the super-warm LIFA Merino Crew packs a punch.