Best Thermal Layers

Invest in a good base layer and you will be able to stay warm without getting too sweaty. Look out for merino wool versions that will stay fresh for days without washing.

One of the most highly regarded brands on the market is Icebreaker, which offers a range of long- and short-sleeve base layers. It’s a good all-round performer and comes in quite a lot cheaper than its rivals.

Alongside merino wool, another material of choice is yak wool. That’s what you get with the Kora Shola 230, a base layer with a half zip for easy ventilation. It’s incredibly warm, and perfectly suited for high-altitude skiing or climbing.

For a midweight option, try Patagonia Capilene Air Crew, which has eco-friendly credentials thanks to the use of recycled polyester. It also looks like a standard sweater, so you can wear it for casual occasions, too.

Heritage brand Helly Hansen does a range of base layers, and the Lifa Merino 1/2 zip is among its best. It’s available in a huge range of colors so you can choose your favorite. Combining merino wool on the outside and synthetic fabric against the skin, the Lifa 1/2 zip works well when you’re active and when you’re chilling out.