Merino Thermals FAQ
What weight merino thermals do I need?
The best merino thermal weight depends on the weather, your activity level and how much you feel the cold. Lightweight merino, around 150 to 190gsm, is best for active use and milder conditions. Midweight merino, around 200 to 250gsm, is the most versatile choice for skiing, snowboarding, hiking and everyday winter layering. Heavyweight merino, 260gsm and above, is best for freezing temperatures, low activity and very cold overnight conditions.
What does GSM mean in merino thermals?
GSM stands for grams per square metre and tells you how thick and warm the merino fabric is. A lower GSM, such as 150 to 190gsm, feels lighter and more breathable. A higher GSM, such as 200gsm, 230gsm or above, gives you more warmth for colder conditions.
Are 200gsm merino thermals warm enough for skiing?
Yes, 200gsm merino thermals are a great all-round choice for skiing and snowboarding because they balance warmth and breathability. They help keep you warm in cold weather without feeling too bulky under snow jackets and pants. If you really feel the cold, or you’ll be in freezing conditions for long periods, you may prefer a heavier merino layer.
Should I choose lightweight, midweight or heavyweight merino thermals?
Choose lightweight merino for hiking, travel, high-output activity or milder winter days. Choose midweight merino if you want one versatile thermal layer for skiing, snowboarding, camping, winter walks and everyday cold-weather wear. Choose heavyweight merino if you need maximum warmth for freezing temperatures, sleeping outdoors or standing around in very cold conditions.
Should merino thermals be tight or loose?
Merino thermals should usually fit close to the body, but not so tight that they restrict movement. A snug fit helps trap warmth and move moisture away from your skin, especially when worn as a base layer under snow gear, rainwear or outdoor clothing. For higher-output activities like hiking, some people prefer a slightly more relaxed fit for comfort and airflow.
Are merino thermals good for hiking and travel?
Yes, merino thermals are a great choice for hiking and travel because they are breathable, naturally odour-resistant and comfortable to wear for long periods. Lightweight merino is especially useful when you want warmth without bulk, and when you need clothing that can be worn more than once between washes.
