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Finntrail · Snow suits
Finntrail BACKCOUNTRY Blue 3903 Snow Suit
A top-tier one-piece snow suit with a Japanese TORAY DERMIZAX® membrane, integrated suspenders and a drop-seat, built for extreme and professional snowmobiling. The TORAY DERMIZAX® membrane offers high water resistance (20,000 mm) and excellent breathability (10,000 g/m²/24h), while Japanese YKK Aquaguard zippers and fully taped seams keep moisture out. This is an uninsulated shell for layering: you set the warmth yourself with base layers, so you never overheat even when riding hard.
Who it is for
Made for extreme and professional riding in winter, when you need the best membrane, breathability and protection, and add warmth with base layers.
- •For extreme snowmobiling at a professional level.
- •For long, active routes, where breathability and ventilation matter.
- •For layering with a base and insulating layer, when you choose the warmth yourself.
When it shines
It performs best when riding hard from +15 to −20 °C: the premium membrane and ventilation vent sweat so you don’t overheat, while the one-piece cut and taped seams keep snow and moisture out.
Technical specs
Materials & technology
TORAY DERMIZAX® premium membrane
A high-tech Japanese membrane for active sport: high water resistance (20,000 mm) and excellent breathability (10,000 g/m²/24h), protection from wind, moisture and condensation. A higher-grade solution than a standard membrane.
YKK Aquaguard zippers and taped seams
Japanese YKK Aquaguard zippers with a water-repellent surface and fully taped seams keep moisture out at the key points, so water and snow stay outside.
Ventilation and uninsulated shell for layering
Ventilation at the underarms, collar and inner seam with an inner mesh against snow vents sweat. The suit has no insulation: you set the warmth yourself with base layers (for example a Finntrail base layer), so you don’t overheat as you move.
Cordura and 3D anatomical knees
Extra-tough Cordura reinforcements, 3D anatomical knees, inner seam and lower legs withstand heavy use, while the one-piece cut, snow gaiters and drop-seat keep snow out.
How it differs from an ordinary winter suit
Care
Wash cool, on a gentle cycle, without softener or bleach. Restore the water-repellent finish (DWR) with a dedicated proofer. Dry at low temperature, not on a radiator or by a fire: high heat damages the materials and the membrane. Store in a dry, ventilated place.
Frequently asked questions
What kind of suit is this?
It is a top-tier one-piece snow suit with integrated adjustable suspenders and a drop-seat, made for extreme and professional snowmobiling. The one-piece cut keeps snow out, while the suspenders hold the suit in place.
Is the suit warm?
Honestly: it is an uninsulated premium shell made for layering, so it does not add warmth on its own. The warmth comes from the layers underneath, for example a Finntrail base layer and an insulating layer. This lets you regulate warmth to the weather and avoid overheating when riding actively.
What makes the premium membrane special?
BACKCOUNTRY Blue uses a Japanese TORAY DERMIZAX® membrane: high water resistance of 20,000 mm and better breathability of 10,000 g/m²/24h, fully taped seams and Japanese YKK Aquaguard zippers. It is a higher-grade solution than a standard membrane, made for extreme and professional riding.
What cold is it good for?
With suitable base layers the suit works from +15 to −20 °C when riding actively. As it is a shell, the temperature range depends on the base and insulating layers you choose and how actively you move.
How does it keep snow out?
The one-piece cut, integrated snow gaiters, high collar with microfleece lining and ventilation with an inner mesh against snow keep snow out even in a fall or deep snow. Cuffs with thumb holes keep the sleeves in place.
How do I care for it and restore protection?
Wash cool on a gentle cycle, without softener or bleach, and dry at low temperature. Periodically restore the water-repellent finish (DWR) with a proofer so the membrane keeps repelling water and breathing.
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 from our Vilnius warehouse with a tracking number.
Not sure about the size or whether it suits 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.
Water resistance12 000 mmHow to Choose the Correct FINNTRAIL Men’s Snowmobile Gear Size
Choosing the correct snowmobile gear size is important for comfort, freedom of movement, heat retention, and protection against snow, wind, and moisture. Gear that is too small may restrict movement and feel tight when worn with base and insulation layers, while gear that is too large may reduce heat retention and make active movement less comfortable.
The FINNTRAIL snowmobile gear size chart shows body measurements, not garment measurements. The gear is designed with extra room for comfort, movement, and proper layering in cold weather.
Measure Your Chest
Measure around the fullest part of your chest, keeping the measuring tape horizontal. Stand straight and keep the tape close to the body, but not tight.
How to measure: measure around the widest part of your chest while breathing normally and keeping your body relaxed.Measure Your Waist
Measure around the narrowest part of your waist or where you naturally wear your pants. This measurement is especially important for pants and bibs, so the gear does not restrict movement while sitting, bending, or riding actively.
Important: do not pull in your stomach or tighten the measuring tape too much. Snowmobile gear should leave enough room for base and insulation layers.Measure Your Hips and Largest Girth
Measure your hips around the widest part. Also check your largest body girth — this may be the chest, stomach, or hips, depending on body shape.
Main rule: if one measurement falls into a larger size, choose the size according to your largest body girth. This helps prevent tightness and restricted movement.Measure Your Inseam and Arm Length
Inseam is measured from the crotch to the inside of the ankle. Arm length helps determine whether the jacket sleeves will properly cover your arms during movement and when wearing gloves.
These measurements are especially important for taller users or people with non-standard proportions. If your girths match one size but your height or limb length matches another, consider longer or wider size options.
How to Use the Size Chart
Measurement Description Height Body height in centimeters. Chest Chest circumference measured around the fullest part of the chest. Waist Waist circumference. Hips Hip circumference measured around the widest part of the hips. Largest Girth The largest body circumference — chest, stomach, or hips. Inseam Inside leg length from crotch to ankle. Arm Length Sleeve / arm length. First, check your girth measurements: chest, waist, hips, and largest body girth. Then confirm whether the selected size also matches your height, inseam, and arm length.
Reference Size Chart
Size Height Chest Waist Hips Largest Girth Inseam Arm Length XXS 155–165 80–86 70–76 82–88 86–90 70–72 53–57 XS 165–170 84–94 74–90 86–96 92–98 73–75 55–59 XSK 165–170 100–110 90–100 102–112 106–112 73–75 57–61 S 170–175 88–98 78–88 90–100 96–102 76–78 57–61 SK 170–175 100–110 90–100 102–112 108–114 76–78 57–61 M 175–180 96–102 86–92 98–104 101–105 79–81 59–63 MK 175–180 108–117 98–107 110–119 112–120 79–81 59–63 ML 180–190 96–102 86–92 98–104 101–105 85–87 61–64 L 180–185 100–110 90–100 102–112 106–111 82–84 61–64 LK 180–185 116–125 106–115 118–127 121–127 82–84 61–64 XL 180–190 108–117 98–107 110–119 112–120 85–87 61–64 XLK 180–190 124–133 114–123 126–135 128–136 85–87 63–65 XXL 185–195 116–125 106–115 118–127 121–127 88–90 63–65 XXXL 195–200 124–133 114–123 126–135 128–136 91–93 65–69 What Do K and L Size Markings Mean?
S M L XLStandard sizes for men with average body proportions.
MLLonger size for taller users whose body girths match size M but who need extra length.
XSK SK MK LK XLKWider sizes for larger chest, waist, hips, or overall largest body girth.
XXL XXXLLarger sizes for taller users and broader body types.
If You Are Between Two Sizes
If your measurements fall between two sizes, consider how you will use the gear. For active movement and layering, it is usually better to choose a size that does not create tension in the fabric.
- If warmth and layering are the priority, choose the larger size.
- If you will use the gear actively, make sure it does not restrict knees, shoulders, or arms.
- If height matches one size but girths match another, prioritize the largest body girth.
- If you will wear a thicker insulation layer, leave additional space.
Important: snowmobile gear should not fit like everyday clothing. It must allow space for base layers, insulation, air gap, and unrestricted movement.Recommendation Before Ordering
Before ordering FINNTRAIL snowmobile gear, measure your main body parameters and compare them with the chart. Take measurements while wearing a thin base layer or clothing similar to what you will actually wear under the gear.
Best result: provide your height, chest, waist, hips, and largest body girth. If possible, also include inseam and arm length.Summary
To choose the correct FINNTRAIL men’s snowmobile gear size, the most important measurements are height, chest circumference, waist circumference, hips, largest body girth, inseam, and arm length. A correctly selected size ensures warmth, freedom of movement, comfortable layering, and effective protection in winter conditions.
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 all parcel lockers in Lithuania or by courier to your home.
- Delivery is free of charge.
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 completely free.
- 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.
