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Ski Underwear

Merino stays warm when damp, synthetics dry faster. Cotton is no use here.

Guide

Ski Underwear

For days on the piste, choose ski base layers cut close to the skin: a long-sleeved top and 3/4-length bottoms, around 200 g/m² in merino. Merino stays warm when damp and resists odour.

Key points

Piste: top and 3/4 bottoms, merino around 200 g/m².
Merino stays warm when damp; synthetics dry faster.
Base layers must touch the skin everywhere. No cotton.

Which type for which use?

Use	Choose	Reason
Piste days with lift rides, hut-to-hut trips	ChooseMerino wool	Reasonwarm when damp, slow to smell. slower to dry, needs a wool wash
Freeride, high-output days	ChooseSynthetic (polyester, polyamide, polypropylene)	Reasondries fastest, easy to wash. smells sooner, feels colder at rest
Ski touring, changing pace	ChooseMerino-synthetic blend	Reasondries faster than pure wool, stays fresh longer than synthetic. wool content in the range runs from about 30% to 80%
Hard skiing, days with a pack	ChooseSeamless with body mapping	Reasonno side seams, zones for warmth and venting. very close fit, so size carefully
The chalet and everyday wear	ChooseCotton	Reasonsoft on the skin. soaks up sweat and stays wet: not for skiing

Types compared

Merino wool
Warm when damp, for lift rides and hut-to-hut trips.
- Advantage: Warm when damp
- Drawback: Slower to dry
Example: We Norwegians Snø Zip-up Men ›
Synthetic
Dries fastest, for freeride and high-output days.
- Advantage: Dries fastest
- Drawback: Smells sooner
Example: Goldbergh Mika Baselayer top ›

What to look for when buying

Question	In brief	Why
Merino or synthetic?	In briefCold or sweaty?	WhyMerino if you get cold on chairlifts or wear the same top for days: wool stays warm when damp. Synthetic if you sweat hard and wash every evening, because it dries faster.
What fabric weight do I need?	In briefMerino: 200 to 260 g/m²	WhyFor merino, Odlo recommends at least 200 g/m² in winter. Merino from 260 g/m² suits cold days on the piste, though some skiers find it too warm for skinning uphill.
How tight should a ski base layer be?	In briefSnug, no wrinkles	WhyIt has to touch the skin everywhere, otherwise sweat stays put. Nothing should dig in at the waist, underarms or behind the knees. The Cut filter calls this ‘Slim fit’.

Frequently asked questions

How do I wash merino ski base layers?

Follow the care label. Icebreaker specifies a gentle cycle at 30°C with a mild liquid detergent and no fabric softener, and advises against tumble drying. Devold allows a 40°C wool programme and a low tumble dry for some pieces.

How many days can I wear merino thermals?

Several ski days if you air them overnight. Woolmark cites a New Zealand study in which wool held 66% less body odour than polyester. Synthetic ski base layers smell sooner and belong in the wash after a day on the hill.

Is merino itchy?

Fine merino is not. According to Woolmark, only coarse fibres above 30 microns irritate the skin, whatever the material. Devold lists 17.5 microns for its light merino underwear. If you are still sensitive, choose a blend or a synthetic.

Can I ski in my regular base layers?

Often, yes. Long base layers in synthetic, or in merino of 200 g/m² or more, do the same job. Ski-specific pieces add 3/4 length for the boot and often knit zones for warmth and venting. Just not cotton.