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

Sale price: $30.00 Regular price: $34.99

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

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Sale price: $30.00 Regular price: $34.99

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San Francisco, 735 Market St. Options

Select an available color and size to see options.

Model: 8548379

Product Features

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

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

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

Moisture wicking

GOOD: intelligent bodymapping for effective transfer and fast 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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Men's Seamless Ski Base Layer Top BL 580 I-Soft – Black Blue, black Image 7 of 6
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Also excellent for riding a motorbike.

I purchased this thermal shirt, to be used under the motorcycle jacket, for outings in less than mild weather. I am very satisfied with the result

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My worst Decathlon purchase

Before purchasing it I consulted multiple videos and reviews. I am 1.82m tall and weigh 82kg, I took the largest size and yet it compresses my arms and abdomen unbearably. Tremendous. I use it to clean car windows. Personally, I advise against it without any reservations.

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Keep warm...

Keep you warm whether on a motorcycle or when working outdoors.

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Buy 1 smaller than me

very nice product

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In the top!!!

I put it with another thermo garment. Night work so perfect.

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Very pleasant

I use it in winter as a base layer for both skiing and cycling.

really great

really great



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good product

good product

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second skin

I used this thermal for some trekking and I must say that I found it very good, it fits the body excellently and allows freedom of movement. It manages sweat well except in the lower back where, having a backpack, it struggles to work well. Good heat input and balanced price with yield

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Used in underwear…

Used as running underwear in cold weather. Very happy, good sweat evacuation and good heat retention.

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It would be nice if there…

It would be nice if there were more choices in colors.

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Good product, holds close…

Good product, fits close to the body and maintains body heat despite a thin top layer

Excellent value.

Excellent value.

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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.It offers a second skin effect with a slim fit that limits rubbing.

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 enables very good moisture management, reducing odours thanks to its natural properties as well as 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: soft, feeling of warmth, comfort on the skin. It also increases the performance of the product with better thermoregulation, the damp absorption and thermal insulation. To achieve this softness, the base layer is brushed.

What is i-band technology?

An innovation located at the waist so that the fabric is always well-positioned and does not ride up when practising. 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.

How to dress to stay warm on the slopes?

All you need is 3 technical layers to stay warm on the ski slopes. Layer 1 or second skin, to stay dry. Layer 2 or an insulating layer, to keep the heat in. Layer 3 or a protective layer, to protect against bad weather.

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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