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Ski I-Soft, Thermal Underwear Base Layer Top, Men's

Sale price: $34.99 Regular price:

Enjoy the unprecedented comfort of this incredibly soft second skin thanks to its I-Soft technology (brushed fabric).

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Sale price: $34.99 Regular price:

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San Francisco, 735 Market St. Options

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Model: 8548384

Product Features

A photo of the Ski I-Soft, Thermal Underwear Base Layer Top, Men's in use

Ski I-Soft, Thermal Underwear Base Layer Top, Men's | Developed for skiers who practice at moderate intensity (high perspiration) in cold weather, looking for a comfortable and extremely soft second skin.

Enjoy the unprecedented comfort of this incredibly soft second skin thanks to its I-Soft technology (brushed fabric).

Moisture wicking

AVERAGE: Intelligent body mapping for perspiration wicking and quick drying.


AVERAGE: body mapping integrated with a brushed component for increased warmth.

Odor control

AVERAGE: the polyamide fiber has an average odor-reducing capacity.

Irritation reduction

Seamless technology: few seams to limit irritation.

Product Customer Reviews

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429 Reviews
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Ski I-Soft, Thermal Underwear Base Layer Top, Men's,black
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Too short

Did the job. No slippery like other base layers. Worried they may wear prematurely. The legs are too short. Long wool socks cover that.

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Hi David,

Sorry to hear you were not completely satisfied with your purchase. If you would like to explore other sizes or options, feel free to bring back the original product for an exchange or refund. Our staff would be happy to assist you.

base layer

great value for money

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Ridiculous sizing

Far too small, com 1/2 way up the leg, they are like a child’s fitting and very thin fabric. Not at all warm.

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Why pay more?

Great quality for the price.

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New season approaching

Excellent fit and can’t wait to try them on the slopes!

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Ski base layer bottoms

Well priced comfortable fit and excellent quality

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Wonderful product, worth buying

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DO NOT BUY ABSOLUTE WASTE OF MONEY. This is being sold as base layer for very low temperature, winter trekking. It just does not work. The material hold no warmth. Sweat trikkles out making u colder and flimsy swim suit material.

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Hello Chandan,

Thank you for your review.

I am sorry to hear about your experience with our product.

Could you please describe what was the layering on top of the Base Layer?

As you mentioned, you felt the Base Layer was not able to hold enough heat & sometimes led to sweating as well. This happens when there is not a good balance of sufficient ventilation & heat retaining capacity of the 2nd and 3rd layer of trekking apparels.

Perhaps the problem arrives from here.

I hope this helps in future treks.

Nice day!


Jaswinder Singh Maan.

Merchandiser, Decathlon Sports India.



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Soft and durable

Product is soft and durable. Expected it to be warm but not much effective in high altitudes.

Good Product.

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Must recommended

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not warm

it is not as warm as i expected it..i think i wasted my money..

Hello Javaid

Thank you for taking the time to give your valuable review. We are sorry that you were not satisfied with the product. This base layer is designed for Ski and hence along with warmth moisture management and reducing chafing is also its major technicity as you are very active while skiing. However, we understand that if you bought these for normal purposes when you are static and not in too much action the level of warmth would not be great.

We apologise for not being able to guide you during the time of purchase, Please feel free to return the product at your nearest Decathlon store or via your Decathlon mobile app.


Product Trainer and Passionate Backpacker

Decent Buy, beware of the lint balls!

It provides a warm inner layer, under a pair of Jeans or Fleece Pants. One thing that I'd like to mention is the lint balls. It can be annoying sometimes (and for some people)! But since it's an inner layer, I don't fret about it too much!

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good buy

inner layer for north indian winters works well

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Size Guide

Size Guide Visual

Additional Product Information


Main fabric

  • 97% Polyamide
  • 3% Spandex

What is the fit of the i-soft base layer?

The I-Soft base layer comes in a SLIM fit. It stops below the knee to avoid overlapping layers (socks and base layer) creating folds in the ski boot, which may affect your comfort. It offers a second skin effect with a slim fit that limits rubbing.

What are the benefits of polyamide?

Polyamide is the strongest textile raw material (even when wet) and is highly stretch. It is breathable, manages moisture very well, naturally reduces odors and has good heat-regulation properties. The super soft, specially textured yarn gives fabrics a silky natural feel. Ideal for tight-fitting, seamless clothing.

Technical structure of the product

Thanks to its intelligent body mapping and brushed polyamide fiber based on I-SOFT technology, this second skin guarantees you a feeling of warmth distributed evenly over your body.

What is i-soft technology?

I-soft technology increases the performance of the fabric via different benefits: soft, feeling of warmth, comfort for the skin. Also, it increases the performance of the product with better thermoregulation, the absorption of damp and thermal insulation. To achieve this softness, the base layer is brushed.

What is i-band technology?

An innovation located at the waist, enabling the fabric to always be well positioned so that it does not ride up when practicing. Also, the top and bottom of our i-soft are equipped with this technology, so that all you have to worry about are your holidays.

A product-specific environmental rating

The product's environmental footprint is calculated for its entire life using various indicators. A score from A to E is given to help you easily identify the most eco-friendly products by comparing products of the same type (T-shirts, pants, backpacks, etc, ...)



Product testing

All Wedze products are conceived, designed and developed in the Mont Blanc Valley. They are then tested under the same conditions as you would experience in real-life use (snow, cold, powder snow, etc.) The design teams make sure that the program for which the product is designed and developed corresponds perfectly to its use in the field.

Storage instructions

Dry thoroughly before storing.

Superior quality. Unbeatable prices.

For 40 years, Decathlon has delivered the best value in the retail sports industry by offering high-quality, sustainable and cost-effective products.

Decathlon makes the difference
  1. product-research

    Research and development

    delivers high-quality cost-effective products

  2. State-of-the-art production processes

    minimize manufacturing costs

  3. Optimized supply chain

    reduces retail prices

  4. laptop-checkout

    Minimal retail footprint

    lowers overhead and indirect costs


Size Guide Visual