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Men's Seamless Ski Base Layer Bottom BL 580 I-Soft – Black/Blue

Sale price: $34.99 Regular price:

Enjoy the unprecedented comfort of this seamless base layer thanks to this incredibly soft “second skin” with 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

Select an available color and size to see options.

Model: 8548384

Product Videos

Product Features

A photo of the Men's Seamless Ski Base Layer Bottom BL 580 I-Soft – Black/Blue in use

Men's Seamless Ski Base Layer Bottom BL 580 I-Soft – Black/Blue | Developed for skiers who practice at moderate intensity (mild perspiration) looking for a comfortable and extremely soft second skin in cold weather.

Enjoy the unprecedented comfort of this seamless base layer thanks to this incredibly soft “second skin” with I-Soft technology (brushed fabric).

Moisture wicking

GOOD: smart body mapping for perspiration wicking and quick drying.


AVERAGE: body mapping integrated into a brushed component 165 g/m2

Irritation reduction

Seamless Technology: fewer seams to reduce irritation.

Odor control

The component limits perspiration odours Lab tested to ISO 17299-3.

Questions & Answers

Product Customer Reviews

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477 Reviews
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Men's Seamless Ski Base Layer Bottom BL 580 I-Soft – Black/Blue,black
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Awesome quality

Very comfortable and do as described

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Hello Allen,

Thank you for the 5-star review. We are glad you are satisfied with your purchase with us and its the right product for your needs. Have a great day. :)

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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Very nice fabric

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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

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Size Guide

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Additional Product Information


Main fabric: 97.0% Polyamide, 3.0% Elastane

What type of fit is the bl 580 i-soft ski base layer?

The BL 580 I-Soft thermal base layer comes in a SLIM fit. They stop below the knee to avoid overlapping layers (socks + base layer) creating folds in the ski boot, which may affect your comfort. They are like a second skin that hugs the body, which reduces rubbing and improves moisture wicking.

What are the benefits of polyamide?

Polyamide has the highest strength of all textile raw materials (even when wet) and is very stretchy.This breathable fibre manages moisture very well and provides good temperature regulation.These specially textured super-soft yarns give fabrics a silky, natural feel. Ideal for tight, seamless clothing.

Technical structure of the product

Thanks to its intelligent bodymapping and brushed polyamide fibre created from I-SOFT technology, this second skin will ensure you feel a warmth that is distributed evenly over the whole body.

What is i-soft technology?

I-soft technology enhances the fabric's performance, providing a variety of benefits: softness, warmth and next-to-skin comfort. It also enhances garment performance, providing better heat regulation, humidity absorption and thermal insulation. To achieve this softness, the base layer is brushed.

What is i-band technology?

I-Band technology is an innovative design used around the waist of the I-Soft top and bottom base layers. It helps keep the garment in place so that it doesn't ride up or fall down when skiing.

A product-specific environmental rating

The environmental impact of the product is calculated over its entire life cycle and using various indicators. An overall 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, trousers, backpacks, etc.)

This product is repairable

We commit to repairing your product free of charge for the duration of the warranty. Whatever it is, snags, seams, zips, etc., these solutions are offered in your usual store. However, if we can't repair your product (production defect), we will exchange it or reimburse you.

To help you choose the right size

The model on the photo is wearing a size M and measures 185 cm. 
Chest measurement: 104 cmWaist measurement: 104 cmArm length: 45 cmInside leg length: 80 cm

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 ensure that the programme for which the product has been designed and developed matches perfectly with 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


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