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Men's Seamless Ski Base Layer Bottom BL 580 I-Soft – Black/Blue
Enjoy the unprecedented comfort of this seamless base layer thanks to this incredibly soft “second skin” with I-Soft technology (brushed fabric).
Free shipping over $49
Free returns
Free pickup
San Francisco, 735 Market St. Options
Select an available color and size to see options.
Product Videos
Product Features

Moisture wicking
GOOD: smart body mapping for perspiration wicking and quick drying.
Warmth
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
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Product Customer Reviews

Very comfortable and do as described
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. :)
Anna
Did the job. No slippery like other base layers. Worried they may wear prematurely. The legs are too short. Long wool socks cover that.
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.
Katherine
great value for money
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.
Great quality for the price.
Excellent fit and can’t wait to try them on the slopes!
Well priced comfortable fit and excellent quality
Very nice fabric
Wonderful product, worth buying
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.
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!
Regards,
Jaswinder Singh Maan.
Merchandiser, Decathlon Sports India.
Excellent
Product is soft and durable. Expected it to be warm but not much effective in high altitudes.
Good Product.
Must recommended
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.
Gokul BHANDARI
Product Trainer and Passionate Backpacker
Size Guide

Additional Product Information
Composition
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. Measurements: 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.
Origin
Imported
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
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Research and development
delivers high-quality cost-effective products
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State-of-the-art production processes
minimize manufacturing costs
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Optimized supply chain
reduces retail prices
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Minimal retail footprint
lowers overhead and indirect costs

Men's Seamless Ski Base Layer Bottom BL 580 I-Soft – Black/Blue
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Heavy products return policy
If you return a product you will receive a refund for the purchase price plus any applicable sales taxes, less any non-refundable charges.
Decathlon will cover all shipping costs associated with your return except for items excluded from our return policy such as bikes, basketball hoops, snowboards, surfboards, tents, and other larger / heavier items.
Return costs for heavy products:
Weight Thresholds | Shipping within California | Shipping outside of California |
---|---|---|
> 9 lbs | $20.00 | $25.00 |
> 30 lbs | $50.00 | $65.00 |
> 100 lbs | $100.00 | $125.00 |
> 200 lbs | $200.00 | $230.00 |
If you return a product at any of our store locations, we will gladly help you find the best alternative product or refund you on the spot.
