If washed in cold water on a gentle cycle and air-dried, quality merino base layers should not shrink. However, even one wash in warm or hot water, or one trip through a hot dryer, can cause permanent shrinkage of 5–15%. Some brands pre-wash their merino to prevent further shrinkage, but this isn't universal. When in doubt, assume the garment hasn't been pre-shrunk and follow cold-water care religiously. Also note that merino can temporarily stretch during wear and return to its original size after proper washing.
Ski Underwear · Merino Wool Base Layers
Will my merino base layer shrink if I wash it correctly?
Related gear types
If this answer nudged you toward a different style, these guides compare specs and trade-offs.
Lightweight Base Layers
$25 – $90
Thin, highly breathable base layers for high-output skiing in mild conditions or warm-skinned individuals.
ultra-thin fabrichigh breathabilityrapid moisture wicking
Midweight Base Layers
$35 – $130
Versatile, moderately insulated base layers that are the most popular choice for typical winter skiing conditions.
moderate insulationgood breathabilityeffective moisture wicking
Synthetic Base Layers
$20 – $80
Budget-friendly, quick-drying base layers made from polyester or polypropylene for reliable moisture management.
rapid dryinghighly durableaffordable
More questions
- Doesn't merino wool itch against the skin?
- How many days can I really wear a merino base layer before it smells?
- Is merino really worth the higher price compared to synthetic base layers?
- Can I put my merino base layer in the dryer?