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Product Images

Castelli Mens Free Aero RC Short Black
Castelli Mens Free Aero RC Short Black
Castelli Mens Free Aero RC Short Black
Castelli Mens Free Aero RC Short Black
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Castelli Mens Free Aero RC Short 1
Castelli Mens Free Aero RC Short 2
Castelli Mens Free Aero RC Short 3
Castelli Mens Free Aero RC Short 4

Castelli Men's Free Aero RC Short


Pricing and Order Section

Mfg PartNum:
MSRP: $199.99
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The Evolution Of Innovation

The Castelli Men's Free Aero RC short is Castelli's top race short, which also means that it's insanely comfortable even if you never pin on a number.

It's fair to say that the Free Aero RC has been in development for the past 15 years. That's how long it's been since the original Free Aero Race short was first introduced, initially as Castelli's top-of-the-line race short. Since then it has won three Tours de France, three Giro d'Italia, one Vuelta and San Remo, but it also became the best-selling product in the history of Castelli because, simply put, these are the shorts that do everything well.

The concept is quite simple: start with the best pad made, surround it with a supportive standalone short with good muscle compression, and then remove everything else that's not absolutely necessary.

You feel Free because of further refinements to the Progetto X2 Air seamless seat pad. The two densities of foam plus the gel pads provide progressive damping, while the separate Skin Care Layer is soft and stretchy to move with your skin.

You feel Free because this is the first high-end short that doesn't need any sort of gripper or elastic at the end of the leg to keep the leg in place. Getting this right meant 28 prototypes and one of Castelli's most extensive test programs, and the result is the most comfortable leg ending in the Castelli catalog.

The Forza 2 fabric has 32% Lycra with a high modulus for exceptional muscle support and just the right amount of compression. There's reflective piping on the back. And all logos are either stitched or embossed for durability.


  • High-compression 215 g Forza 2 fabric with 32% Lycra
  • Progetto X2 Air Donna seamless seat pad is soft against the skin
  • Rear mesh pocket
  • 5-panel construction for reduced seams and less chafing
  • Stitched scorpion logo patch and embossed Castelli wordmark for durability
  • Reflective piping on back of legs
  • Raw-cut edge at waist for extra stretch and comfort
  • Raw-cut leg ending engineered to stay put without silicone grippers
  • Small: S-3XL

  • Free Exchanges: This product qualifies for free exchanges within the first 60 days after order. We'll cover the shipping both ways for US customers if you need a different size and/or color of this product. Returned product must be in new condition with all labels and packaging. Free exchanges apply only for product in stock or available for backorder.

    B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

    Size Chart



    Style Type: Shorts 

    Black - Small

    Mfg PartNum: L4522001010-2 

    Black - Medium

    Mfg PartNum: L4522001010-3 

    Black - Large

    Mfg PartNum: L4522001010-4 

    Black - X-Large

    Mfg PartNum: L4522001010-5 

    Black - 2X-Large

    Mfg PartNum: L4522001010-6 

    Black - 3X-Large

    Mfg PartNum: L4522001010-7 


    Ordered by Most Relevant First
    5 stars
    4 stars
    3 stars
    2 stars
    1 stars
    Reviewed 12/26/2023
    by Anonymous
    Cycling Enthusiast
    New Jersey
    Value Rating
    Overall Rating
    great shorts but size up

    Very comfortable, but definitely get a size larger. It takes 4-5 rides to break in the chamois.

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    Thank you for your feedback.
    Reviewed 6/16/2023
    by Rick
    Cycling Enthusiast
    SW Michigan
    Value Rating
    Overall Rating
    These are the best.

    I ride over 10,000 miles a year and I've tried a lot of different bike shorts. In my opinion these are the best you can buy. They are comfortable for any kind of riding and any distance. They hold up well. I'm 5'1" about 160 pounds and I wear the xl size.

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    Thank you for your feedback.
    Reviewed 9/19/2022
    by rac47
    Overall Rating
    5 of 8 customers found this review helpful.
    European Sizing is way undersized

    I have bought this short for a number of years and had to return twice. Have ordered L previously but ended up having to go to XL and then 2XL to get a proper fit.

    My weight over this time has remained the same.

    Was this review useful to you? Yes/No
    Thank you for your feedback.
    Reviewed 5/15/2023
    by Red bike guy
    Cycling Enthusiast
    Corvallis OR
    Overall Rating
    Second pair

    Castelli is top notch quality. My previous pair lasted 9 years. Very compressive fabric. Go up one size from what you would normally wear. They run smaller.

    Was this review useful to you? Yes/No
    Thank you for your feedback.
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