How does the U-9 W fit, and should I size up or down?

The U-9 W has a close, women's base-layer fit designed to sit smoothly under outerwear. For a next-to-skin fit take your usual size; size up for a looser feel.

Merino wool regulates temperature and continues to insulate even when damp, making it a reliable base layer for cold days on the mountain.

Does it manage moisture and odour?

Yes. It is quick drying and naturally anti-odour, with open mesh structure panels that add breathability where needed.

Can I wear it under a shell?

Yes. The seamless, low-bulk construction layers comfortably under mid layers and outerwear.

How should I care for the U-9 W?

Wash on a wool or delicate programme at 30 °C, inside out and separately, with a mild detergent. Do not tumble dry, bleach, or use fabric softener, and iron on low heat if needed.

How fast is delivery, and what does shipping cost?

Orders placed on weekdays before 12:00 CET (EU, Switzerland and Norway) are normally dispatched the same day. Delivery usually takes 1–2 business days in Sweden, 1–3 business days in the EU, Switzerland and Norway, and 2–5 business days for the rest of the world. Shipping costs and any free-shipping threshold for your country are shown before you pay. For our key markets, including the EU, Switzerland, Norway, the UK and the US, taxes and duties are already included in the price.

Can I return or exchange my order?

Yes. You can return unworn items with tags attached within 30 days of delivery through our return portal. Returns are free, except from Germany where a €5 fee is deducted from the refund. We don't offer direct exchanges, so if you need another size or colour, the quickest way is to place a new order and return the original.

Which payment methods can I use?

You can pay with major credit and debit cards, Klarna, digital wallets and, in many countries, PayPal. The available options are adapted to your country and always shown at checkout. All payments are encrypted and handled by our payment partners, and we never store your payment details.

The Mountain Studio U-9 W Seamless Merino Base Top in Lilac Snow, on model front, close-up image

U-9 W Seamless Merino Base Top, on model front, styled with matching leggings image

U-9 W Seamless Merino Base Top, on model side, styled with matching leggings image

U-9 W Seamless Merino Base Top, on model three-quarter side, styled with matching leggings image

U-9 W Seamless Merino Base Top, on model back, styled with matching leggings image

The Mountain Studio U-9 W Seamless Merino Base Top in Lilac Snow, on model front, close-up thumbnail image

U-9 W Seamless Merino Base Top, on model front, styled with matching leggings thumbnail image

U-9 W Seamless Merino Base Top, on model side, styled with matching leggings thumbnail image

U-9 W Seamless Merino Base Top, on model three-quarter side, styled with matching leggings thumbnail image

U-9 W Seamless Merino Base Top, on model back, styled with matching leggings thumbnail image

U-9 W W Seamless Merino Base Top

Base layers

1 500,00 kr

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Ships same business day
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The U-9 W Merino Base Layer Top is knitted from a merino wool and polyamide blend for natural warmth, breathability, and moisture regulation. A close-fitting, quick-drying base layer for skiing and cold-weather days.

World: ACTIVE
Where to use: Skiing, Snowboarding, Hiking, Training

Complete the set

The Mountain Studio U-10 W Seamless Merino Base Pants in Lilac Snow, close-up of lower legs

U-10 WLilac Snow 1 100,00 kr

U-9 W W Seamless Merino Base Top

Reviews for U-9 W

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W Seamless Merino Base TopIn depth