Socks Finntrail EXTREME MERINO DarkGrey 3203
Code: 3203DarkGrey-39-42Price 29 €In stock.
10 pcs - On order (2–4 working days)
0 pcs - In stock in VilniusIn stock: 7 pcsFree delivery in LT, LV and EE · 24-month warranty · 30-day returns · Wrong size? We will swap it
Not sure about the size? Tell us your height, waist and what you will wear underneath. We will tell you which size is yours.
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Finntrail · Socks
Finntrail EXTREME MERINO DarkGrey 3203 Socks
Merino wool
Keeps you warm down to −25 °C
Anatomical shape
For a comfortable fit
Hard-wearing material
Lasts even under heavy use
Comfortable temperature control
Wicks moisture so feet feel dry
The warmest merino wool socks in the line, made for deep winter and hard cold. Thicker and warmer than the regular Merino socks, so your foot stays warm even in severe frost. Merino wool holds warmth and regulates temperature, while the thicker knit adds extra insulation on the coldest days. The elastic fabric adapts to the foot and stays in place, reinforced heel and toe zones take the wear, and the breathable construction wicks moisture away so the foot does not sweat. These are premium warm woollen socks for the coldest season, comfortable all day outdoors.
Who it is for
Made for deep winter and hard cold, when you need the most warmth and it matters that your foot stays warm and dry.
- •For outdoor use and hiking in severe cold.
- •For long hours outside on a cold day, when maximum warmth matters.
- •For the coldest season, when regular socks no longer keep you warm enough.
When it shines
Best in hard frost and deep winter, when you need the most warmth: the thicker merino wool insulates, regulates temperature and wicks moisture away, while reinforced zones protect against wear. For milder cool weather, the regular Merino socks are enough.
Technical specs
Materials & technology
Maximum merino wool warmth
The thicker merino wool knit gives the most insulation in the line and at the same time regulates temperature, so your foot stays warm even in severe cold without overheating. It is a warm woollen feature for deep winter, not cooling socks.
Moisture management and breathability
The merino fibre wicks moisture off the skin, and the breathable construction lets the foot breathe, so your foot stays dry and warm even during long hours outside on a cold day.
Elastic, reinforced construction
The elastic fabric adapts to the foot and stays in place, and reinforced heel and toe zones take the greatest wear, where plain socks wear through first.
How they differ from plain socks
Care
Wash at 30 °C on a gentle cycle with a detergent made for wool and merino (Mountval Wool Wash). Skip the softener: it coats the fibre and merino stops wicking moisture. Odour is handled by a rinse-cycle freshener (Mountval Silver Freshness). Dry flat, away from heaters.
Frequently asked questions
How do these differ from the regular Merino socks?
These are the warmest in the merino wool line. They are thicker and warmer than the regular Merino 3201 socks, so they are made for deep winter and hard cold. For milder cool weather, the regular Merino socks are enough.
Are they really warm?
Yes. These are the warmest socks in the line, made of merino wool. The thicker knit adds more insulation, and merino wool regulates temperature, so your foot stays warm even in severe cold without overheating.
Why merino wool?
Merino wool holds warmth well, naturally regulates temperature and wicks moisture off the skin. So your foot stays warm and dry, and the sock breathes even during long hours outside.
Do the socks stay up?
The elastic fabric adapts to the foot and stays in place, so the sock does not slide down or wrinkle inside the shoe.
How do I choose the size?
Choose your usual size; if you are between two, go up. If unsure, message us and we will help.
What about warranty and returns?
We offer a 2-year warranty, you can return within 30 days, and delivery to Lithuania, Latvia and Estonia is free with a tracking number.
Peace of mind
Warranty
2-year warranty. We resolve manufacturing defects quickly, without bureaucracy.
Returns
Not right? Return within 30 days. We’ll help you pick another size.
Delivery
Free delivery to Lithuania, Latvia and Estonia with a tracking number.
Not sure about the size or whether they suit your activity? Message us, we’ll reply quickly and honestly.
And if you want an answer even faster, ask the Finntrail AI assistant (the ASK button on the page), you’ll usually get a reply right away.
Register this item in the Finntrail Club
Free annual membrane service, priority repairs, early access to new collections and a care coupon worth 3 % of every purchase at finntrail.lt. Registration is free, no matter where you bought the item.
Product Care Instructions
- Wash membrane clothing only with special detergents, such as Mountval Wash & Care, at a temperature no higher than 30 °C, without fabric softeners or bleach.
- After washing, restore water repellency using Mountval Waterproofing Refresher (wash-in) or a spray-on impregnation, following the product instructions.
- After impregnation, allow the product to dry naturally.
- Repair minor membrane damages with special glue, such as Aquaseal / Aquasure, only on clean and dry surfaces.
- Clean boots by hand, do not use a washing machine; if needed, use impregnation products designed for technical footwear.
Regular care helps maintain water repellency, breathability, and prolongs the product's lifespan.
For more information on how to clean Finntrail clothing and boots after use, see here.
Product delivery
We receive goods at our central warehouse twice per week: on Tuesdays and Fridays.
Depending on the order submission time, goods are included in the corresponding delivery cycle:
Order submission time Goods received Notes Until Tuesday 09:00 Friday Standard schedule. Until Friday 09:00 Next Tuesday Orders placed after 09:00 are moved to the next cycle. Important Due to holidays, inventory checks or other circumstances, delivery may be delayed by 1–3 days.
- Orders are shipped the same day they arrive at the central warehouse.
- Delivery is available to parcel lockers in Lithuania, Latvia and Estonia or by courier to your door.
- Delivery to Lithuania, Latvia and Estonia is free of charge. Courier delivery to other EU countries: Poland €4.99, Germany €9.99, other EU countries €12.99. The final cost is shown at checkout before payment.
Returns
Please inform us about a planned return by email at pagalba@finntrail.lt or by phone +370 614 98366.
- Products can be returned within 30 days from the date of receipt.
- The returned item must be unused, with all tags attached and in the original packaging.
- Returns are free within Lithuania, Latvia and Estonia. From other countries the return shipment is paid by the buyer.
- In Lithuania, Latvia and Estonia, together with the notification about the delivered parcel you will receive a return code allowing you to return the item via any parcel locker.
Available solutions after returning the product:- We will replace it with another size.
- We will suggest the most suitable alternative.
- The refund is issued within 1–2 business days after receiving the returned item.
Membrane waterproofing and breathability
Membrane fabric is usually described using two numbers, often separated by a slash: waterproofness and breathability. The first number indicates waterproofness, the second indicates breathability.
?Waterproofing
This is a sliding scale measured in mm that shows how high a column of water you can suspend over the membrane before it starts to let moisture through.
Waterproof Rating Conditions 0–10,000 mm Light rain, dry snow, light pressure. 11,000–15,000 mm Moderate rain, average snow, light pressure. 16,000–20,000 mm Heavy rain, wet snow, some pressure. 20,000 mm+ Heavy rain, wet snow, high pressure. ?Breathability
This is the amount of moisture by weight that can pass through one square metre of fabric over a period of 24 hours. It is commonly measured in g/m²/24 hrs.
Breathability Rating Level of Breathability 0–5,000 g/m²/24 hrs Low – light exercise. 5,000–15,000 g/m²/24 hrs Medium – medium to high energy activity. 15,000 g/m²/24 hrs+ High – vigorous sustained activity.
