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Ski 580 I-Soft Thermal Underwear Base Layer Top Women's
Enjoy the unprecedented comfort of this incredibly soft 2nd skin thanks to its I-Soft technology (brushed fabric).
Free shipping over $35
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: intelligent bodymapping for effective transfer and fast drying.
Warmth
AVERAGE: bodymapping integrated into brushed component for a feeling of warmth
Irritation reduction
Seamless Technology: fewer seams to reduce irritation.
Odor control
AVERAGE: polyamide fiber has a medium capacity to reduce odors.
Product Customer Reviews

Comfortable, warm and looks great!
Hi Kim,
Thank you for taking some time to review our ski base layer, we truly appreciate it!
We are very glad to know that it fits you well and that you are comfortable and warm. We hope to see you again soon!
Sincerely,
L'équipe Décathlon Ottawa
The Ottawa Decathlon team
As with the leggings this top was fantastic...well worth the money. So light and comfortable and fits under anything. Will wear for cycling and skiing !
Simply excellent and so comfortable!
Felt breathable yet kept me warm. Didn't smell even after a few days wear!
Great too wear every day for work as I work in a cold environment. Size was as it states, I'm a medium and I bought a medium and it fits perfectly.
Excellent product.
Bad, torn, doesn't keep warm, rolls upwards
Hello Shreya,
Thank you for your review.
I am sorry to hear about your experience with our product.
To address your concerns Shreya,
> the warmth of the ski base-layer depends directly on the layering & warmth retention of the fleece and jacket on top of this.
> the length of the top at the sleeves is purposefully smaller than normal to fit well with the other layers that need to be worn.
I hope this helps & we hope to serve you better in the future.
Have a nice day!
Regards,
Jaswinder Singh Maan.
Merchandiser, Decathlon Sports India.
Kept me away from chills and I could enjoy my trip well in Finland
Do not buy. This base layer top is badly designed. It bunches up at the waist and makes it look like a tyre on the waist.
Hello Yashoda
Thank you for taking the time to give your valuable review. We are sorry that you were not satisfied with the product. However, we were unable to understand the main issue with the product. Please write back to me with the issue you faced with the product so that we can provide you the best possible solution.
Gokul BHANDARI
Product Trainer and Passionate Backpacker
Cheaper version from wedze apparently felt warmer than this.
Hello Sir,
Thank you for writing to us, this particular product is best when the body is in an active state and also for better breathability with great wicking properties.
Krishna
I hardly wore this for 2 months and the fitting went bad . Too much effort to wear . The heating is good but not worth the price
Hello Maam,
Thanks for writing to us,the product you have bought is the one of the finest thermal we have in decathlon.Yes, the shape of the thermal might go vary but the warmth and the functionality will not change.
This shape is due to the elastane present in the product which gives a second skin effect to trap the warm air in between the layers.
Krishna
Ok
comfortable & soft to wear :)
Wonderful fitting, happy with the product, thanks decathlon
Its a great product, got it for my daughter as a set. Very good quality and keeps her warm.
Size Guide

Additional Product Information
Composition
Main fabric: 96.0% Polyamide, 4.0% Elastane
What is the fit of the i-soft base layer?
The I-Soft base layer comes in a SLIM fit.It acts as a tight-fitting 2nd skin which reduces friction.
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 fiber enables very good moisture management, reducing odors 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 fiber created from I-SOFT technology, this 2nd 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.
How to dress to stay warm on the slopes?
You just need 3 layers to keep dry on the ski slopes:- Layer 1 or a 2nd skin, to stay dry.- Layer 2 or an insulating layer, to keep the heat in. - Layer 3 or a protective layer to protect against the elements.
A product-specific environmental rating
The product's environmental footprint is calculated for its entire life 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, pants, backpacks, etc.)
Product testing
All Wedze products are 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.). Our design teams ensure that the program for which the product was designed and developed corresponds perfectly to 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

Ski 580 I-Soft Thermal Underwear Base Layer Top Women's
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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.
