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Castelli Pro Seamless Arm Warmer Black
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Pro Seamless Arm Warmer

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SALE: $29.74pr.
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A better arm warmer.

Working with professional cycling team, Team Ineos, Castelli worked to develop a better seamless kit to take us into the next riding season and we are happy to welcome the Castelli Pro Seamless Arm Warmer. Other arm warmers on the market are made with a nylon/Lycra® blend that tends to hold moisture, but the development teams at Castelli knew better moisture management could be achieved with polyester yarn. Working with polyester makes it more difficult to get the right stretch, return and manufacturing consistency, though.

Although it took Castelli a year longer than they thought, the final product was well worth the wait. These warmers are a pro rider favorite because they're crazy light and they're extremely warm for their weight, yet even in milder conditions, you don't overheat. They're so stretchy you hardly feel them on, yet when you take them off they occupy a fraction of the space that normal warmers would take in your pocket.


  • Mid-weight seamless arm warmer
  • Surprisingly warm without causing overheating
  • Unique polyester/nylon/Lycra® 78%/15%7% blend
  • Fully seamless construction
  • Folds up extra small

    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.


    Material: Unique polyester/nylon/Lycra blend 

    Black - S/M

    Mfg PartNum: P20046010-2 

    Black - L/XL

    Mfg PartNum: P20046010-4 

    Ordered by Most Relevant First
    5 stars
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    1 stars
    I like the fit
    by Anonymous
    Cycling Enthusiast
    Bay Area

    At first they look like a pair of socks as you pull them out of the packaging. But they stretch in length and width to make a good fit and stay up. I gave a 4 for value just because this is a lot of money for something that looks like a pair so socks but they are less expensive than many options.

    Reviewed 5/24/2021
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