There are plenty of options when it comes to base layers, so it helps to know the simple difference between merino wool and synthetic. Both will keep sweat away from your skin, they just behave a bit differently and suit different people and budgets.
Merino wool base layers Merino is a natural fibre that responds to your body temperature. It helps keep you cooler when you are working hard and warmer when you stop, thanks to tiny air pockets in the wool. It also wicks sweat away from your skin and can hold on to smell‑causing molecules, which means it stays fresher for longer. The main drawback is price, merino is usually the more expensive choice.
Synthetic base layers Synthetic base layers are good at moving sweat away from your skin to the outside of the fabric so it can evaporate. Most synthetic fibres do not absorb much water, so they stay lighter when damp and dry quickly. In practice they often dry a bit faster than lightweight merino, but they can start to smell sooner. Some brands add anti‑microbial treatments to help with this, although these do fade over time. A specialist wash such as Grangers Active Wash can help keep synthetic layers fresher for longer. Synthetics are usually cheaper than merino, which can make them a good value option.
Still unsure? If you are not sure which base layer is right for what you are doing, just ask. We are happy to talk through your plans and help you choose something that will work for you.
The Dart range from Montane makes an ideal base layer, delivering comfort and performance for any activity, at any time
Montane Dart Long Sleeve T Shirt All-season, moisture-managing base layer with fast and light technology, and recycled materials. The lightweight, breathable APEX Polyester fabric used in the Montane Women’s Dart Long-Sleeved T-Shirt is entirely recycled from plastic bottles. This reduces their reliance on virgin resources because virgin polyester is oil based, while the fabric itself has been designed to deliver the perfect balance of warmth, wicking and breathability
The Montane Women’s Dart XT Zip Neck Base Layer is the ultimate high-alpine or expedition base layer. Recycled Apex Thermo fabric with a brushed back offers long-term comfort and high wicking ability – moving any moisture that’s generated away from the body. 4-way stretch also allows for unrestricted dynamic movement, without compromising thermal efficiency. Polygiene treatment also provides essential odour control – perfect for multi day use during high output activities. Whether ski touring, mountaineering, or taking on an expedition in sub-zero environments, enhance your winter layering system with this warm base layer, part of their best selling Dart base layer range.
When the sun’s beating down and temperatures are soaring, this Force technical long-sleeved tee is designed to keep you cool, sweat-free, and protected. It’s built with a lightweight, breathable Dryflo™ Solar fabric that wicks quickly and stays comfortable, whether worn as a base or standalone layer. It also offers UPF 40+ sun protection, ideal for exposed trails or climbs with little shade. Finished with an odour control treatment, it’s perfect for multi-day adventures, packing down small and still useable on day two. With a wearable, casual fit, it’s a staple tee that every mountain person needs on their kit list.
Their 200gsm Merino is designed to keep you warm in cooler temperatures, yet remain breathable and is able to help your body regulate its temperature when you’e pushing yourself to the limits. Naturally odour resistant, this Merino base layer is the best partner for any expedition.
