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

Sale price: $25.00 Regular price: $34.99

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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Size: Select a size
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Sale price: $25.00 Regular price: $34.99

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San Francisco, 735 Market St. Options

Select an available color and size to see options.

Model: 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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Keeps warm

Keeps warm

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Ski shirt

Gift given to a young skier; happy with the heat held and the fit

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Very good material, I bought them for running, I recommend to buy a size smaller, I ordered the L size, the new size, I think the M size would have fit much better.

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A little disappointed

As much as the top was a superb discovery, the bottom part relaxed after only 1 or two uses this winter. It slips a little along the thighs and a little interferes with skiing. Damage :)

Very hot RAS

Very hot RAS

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They fulfill the expected functions

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adequate purchase

Suitable and comfortable product.

Very good products

Very good products

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On top, perfect…

At the top, perfect for Lapland

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easy to wear

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Excellent product

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Used for walking...

Used for sports or Nordic walking under pants. Excellent in cold weather.

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A lifesaver on the go

Very light but warm, my fourteen year old son used it on a trip to Budapest under his pants. A salvation. It fits in your suitcase without taking up space. Nevermore without

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Size Guide

Size Guide Visual

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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