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Women's Radiator SL Base Layer

11 reviews

A totally new take on the summer base layer, the Radiator uses a unique mesh fabric developed by Polartec, made of polyester and a natural fiber derived from wood pulp called Tencel. The fabric regulates body temp far better than synthetic fiber alone. Hence, the Radiator keeps you comfortable through evaporative cooling, by absorbing moisture (Tencel) and drying (polyester) over the surface. The result is a supremely comfortable base layer that performs throughout the summer months and warm to hot climates.

Mesh structure and flat lock construction make for the perfect ultralight summer base layer, designed to be worn in conjunction with our jerseys and bib shorts for the best combination of comfort and performance.


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  • Polartec Delta mesh fabric
  • Engineered evaporative cooling through structure and composition
  • Flat lock seams, strategically placed for minimal friction
  • Tag free design
Materials & Care

Fabric Content

Fabric: 51% Polyester / 45% Tencel / 4% Lycra

Made in IT

Caring for your cycling gear properly will extend its life and maintain its performance, fit and quality. Its important to consider these instructions carefully. While we stand behind the quality of our apparel, not adhering to these instructions will void our warranty against manufacturing & defects. 

We strongly recommend washing your new gear before wearing it. Youll find that your apparel will soften, and fit & comfort will improve after washing - especially with bibs & shorts. 

Machine wash cool, 86F (30C) with like colors: Cooler temps maintain better longevity for your apparel. Like colors, especially lights, will remain more vibrant when washed with like colors. 

Use mild detergent. Do not bleach or dry clean: Strong detergents & bleach can break down the fibers and elastane in the garment, dramatically reducing its life. 

Close all fastenings: this goes also for other garments mixed in with your cycling apparel. Velcro closures or clasps can catch on stitching or trim and damage your garments. 

Lay flat to dry. Do not tumble dry: Do not put your cycling apparel in the dryer. Even on low heat. Dont do it. Heat can damage fabric, elastic and heat transfer logos very easily. Lycra (Elastane) is used throughout our garments to provide compression and support and is susceptible to damage from heat and can irreparably damage your apparel.

Return Policy

The Velocio Signature Guarantee

The Velocio Signature Guarantee underscores our mission to create a better cycling experience. We believe that riding in our gear is the best proof of our commitment to quality and performance. Therefore, we stand behind everything we make. Try any of our products for 30 days to ensure it meets your needs. Wear it. Ride in it. Wash it. We believe it will provide a better riding experience. If you are not 100% satisfied with your Velocio product, you may return it within 30 days of receiving the product.

See our complete return policy


Women's Fit Guide

All Velocio Equipment is designed to fit while in riding position, maximizing the performance of the apparel for its intended purpose. The chart below is a guide to help determine your optimum size.

There is purposely overlap at the outside ranges for each size, allowing you to fine-tune your fit. If your size falls into these overlapping portions, choose the smaller size for a more tailored performance fit, or the larger size for a standard fit.

Still trying to figure it out or need help? Email us at and we’ll be happy to answer any questions. Remember that our Signature Guarantee also backs every piece.



Women's Size Guide

All Velocio Equipment is designed to fit while in riding position. Please refer to the Velocio Fit Guide to find the proper size.

Use the following measurements in the table below to cross reference your size with the size of Velocio garments. For a reference on how these should fit and what size you should purchase, refer to the fit guide.



Size Chest Waist Hip


Customer Reviews
4.6 Based on 11 Reviews
5 ★
4 ★
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1 ★
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United States United States

Great product

I love this baselayer, just as Iove all my Velocio pieces. It pairs seamlessly with my jersey, wicks amazingly well, and basically disappears--I know it's doing its job but I am not aware it is there. The perfect cycling layer!

  • Product fit True to size
  • Size purchased L
Ann G.
United States United States

Runs small

I wear a Medium in most things, so I was disappointed to find how tiny a size Medium was in this top. It was skin tight and the arm holes were very uncomfortable.

  • Product fit Runs small
  • Size purchased Medium


We're sorry this item didn't work out for you in this size! We noticed that this was the first purchase made with us, so we highly recommend following our sizing chart to ensure the garment will fit as intended:

United States United States

my go-to base layer

This base layer is great. I’ve worn it on humid 80-degree days under a feather-weight jersey, and on chilly upper 30-degree days under a thermal jersey and soft-shell. Whatever the weather conditions, it does the job—keeps me dry, and keeps my core temperature comfortable. It’s light-weight and form-fitting, but not overly snug—which I like. My chest is 33” and waist 26”, and this base layer seems like it could stretch to fit ladies with larger measurements. I wear regular shorts/tights (no bibs). I would love for this base layer to be 2” longer, so the tuck-in would be more secure. The photos make it look longer than it is on me. (measurement from back of neck to hemline—size Small—21")

United States United States

Comfortable and functional

Great fit, comfortable, wicks away sweat.

Susanne D.
United States United States

Great base layer!

Love it! Wicks nicely.




We build cycling kit for a better riding experience. Our repair centers can work magic with general wear and tear and support our sustainable mission by extending durability and the lifecycle of every product.


Signature Guarantee

Ride in a new piece of kit for that 30 days and if for any reason you aren’t satisfied, return the piece for a complete refund. There’s a better way to ensure each piece of clothing is right for you and our guarantee promises just that.


1% For the Planet

Our commitment to the environment goes beyond sustainable measures, durable clothing and a focus on circular manufacturing. We commit 1% of our annual revenue to sustainable causes including climate-focused non-profits, and bike advocacy groups.