The weight of merino wool

Fabric (GSM) Weight
Heat level Typical use
146 gsm Merino Very light Ultralight Summer, intense sport, base layer
160 gsm merino wool Light Light 4 seasons, everyday, base layer
190 gsm merino Medium warm Autumn/Winter, versatile
235 gsm flannel Medium + Medium hot Cool weather, comfort
280 gsm Ponte Roma Mid weight Hot Structure + heat
280 gsm brushed merino Mid weight Very hot Winter, cocooning

310 gsm Fleece merino wool

 Very high Maximum Extreme cold

Recommended combinations according to temperature

Temperature Underwear Base layer Intermediate layer Insulating layer Result
-30 °C Panties 146 or 160 gsm 160 gsm top & bottom 280 gsm Ponte Roma 310 gsm merino wool Maximum insulation, comfort in extreme cold
-15 °C 146 or 160 gsm briefs 160 gsm top & bottom 235 gsm flannel or 280 gsm Roma or brushed — Heat/breathability balance
-5 °C 146 gsm Panties 146 or 160 gsm top & bottom 190 gsm or 235 gsm flannel (as needed) — Lightweight, modular, prevents overheating

Choose according to your activity

The right merino wool depends as much on your activity level as on the temperature.

we sweat

Cross-country skiing, snowshoeing, hiking, running, winter biking


A thin layer of merino wool allows perspiration to escape, dries quickly and maintains stable thermal comfort, without feeling cold or overheating.

Recommended weights

  • 146 gsm Very lightweight
  • 160 gsm Lightweight
  • 190 GSM Medium

Breathable, thermoregulating, no sauna effect

Pro tip : The more intense the activity, the lighter the merino wool should be.

effort + breaks

Alpine skiing, snowboarding, alpine hiking

We aim for an optimal balance between warmth and breathability. Layering a base layer with a warmer second layer allows for better moisture management, adaptation to temperature variations, and consistent comfort.

Recommended weights

  • 190 gsm
  • 235 gsm flannel
  • 280 GSM Ponte Roma

Pro tip: A light layer added to a warmer layer (e.g. 160 + 280) = more versatile than a single very heavy layer.

Static activities or cold weather

Winter walking, outdoor work, relaxation, chalet

When you're not moving much or temperatures are extremely cold, the goal is to maximize warmth. Brushed or quilted options offer superior insulation, especially when layered over a base layer, to trap heat and maintain lasting comfort.

Recommended weights

  • 280 gsm brushed merino
  • 310 gsm merino wool

Maximum insulation, comfort, cocooning

Pro tip: Merino underwear adds an invaluable layer of warmth.