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Castelli Pro Seamless Knee Warmer Black
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Castelli Pro Seamless Knee Warmer


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Mfg PartNum:
$34.99 pr.
MSRP: $34.99
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Step Into High Gear With These High-Quality Warmers

Cycling during the cool weather months can be a big guessing game. Starting out, you're freezing! But once you get into your groove, you're on fire. How do you correct this imbalance? To make autumn and spring rides more manageable, the creative minds at Castelli put their heads together as to how to make you stay warm even in chilly temperatures, while also keeping cool after your body heat builds. After working with the professional Ineos cycling team, they developed the Pro Seamless Knee Warmer to enhance your natural body heat without any unnecessary bulk.

Constructed using a unique blend of polyester, nylon, and Lycra® elastane, this lightweight layer provides exceptional warmth and moisture management. With a seamless design, these leg warmers are comfortable to wear as long as you need to, while also stretchy enough to provide a great fit on most body types. Plus, they are super compact, so you can take them off and fold them up to stash in your rear jersey pocket whenever they aren't needed.

These warmers are the ideal choice for early morning or late-night rides in cool to mildly warm weather. So, no more struggling with intermediate temperatures or regretting the decision to wear tights. With the Castelli Pro Seamless Leg Warmer, you can ride like a pro with the gear that will get you through it all.


  • Designed for temperatures 10°C - 20°C (50°F - 98°F)
  • Lightweight 52 grams
  • Mid-weight for comfort
  • Composed of 78% polyester, 15% nylon, and 7% Lycra®
  • Folds up extra small for enhanced packability

  • 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



    Black - S/M

    Mfg PartNum: Q20584010-2 

    Black - L/XL

    Mfg PartNum: Q20584010-4 


    Ordered by Most Relevant First
    5 stars
    4 stars
    3 stars
    2 stars
    1 stars
    Reviewed 1/2/2023
    by bulletcross
    Competitive Racer
    FoCo, CO
    Value Rating
    Overall Rating
    nice lightweight warmer for slightly cool rides

    on my second pair of these knee warmers (I also have and recommend the arm warmers) these are my go to warmers for temps around 50 degrees and up. they do require delicate care putting on and taking off as the stitches can get easily damaged from pulling too hard. otherwise great product.

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    Reviewed 11/23/2023
    by Gary
    Overall Rating
    Castelli quality at a fair price

    Nice fit and feel with just the right amount of grip.

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    Reviewed 5/12/2022
    by Michigan biker
    Competitive Racer
    SE Michigan
    Value Rating
    Overall Rating
    1 of 1 customers found this review helpful.
    Favorite knee warmers.

    Castelli nailed it with these seamless leg, knee and arm warmers. They must use a very high loft insulating fiber to knit them. They are super soft, stretchy and very warm for their weight and thickness. Although they look small when you get them, they stretch a lot. And thus far have not lost their shape or rolled down.

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    Reviewed 1/19/2024
    by Anonymous
    Overall Rating
    Castelli doesn�t disappoint

    Great warm knee warmers. Perfect for those chilly days.

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    Reviewed 11/13/2023
    by Gary
    Overall Rating
    Very Comfortable Knee Warmers

    As usual Castelli makes a product that fits and truly does the job. Thanks Castelli for a great product

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    Reviewed 1/6/2022
    by RipCity Ryan
    Overall Rating
    But one surprise quality

    I expected these to have a fleece lining. Nope. Super thin but they were surprisingly adequate on a 45 day. Alright, okay! Then got a run in them. Once I took them on a longer ride I noticed they slipped down. Overall disappointment. But they will now be my go-to under tights on super cold days.

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    Reviewed 12/18/2020
    by NMBiker
    Cycling Enthusiast
    New Mexico
    Overall Rating
    3 of 3 customers found this review helpful.
    A person expects Castelli to do better

    These knee warmers are comfortable, easy to get on/off, and plenty warm for me, but they won't stay up. If you get them, plan on stopping every hour or so to pull them back up into your shorts. I have since bought a pair of the Pearl Izumi Elite Thermal Knee Warmers, and they are much better. I am sorry I don't have two pairs of those.

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    Mechanic's Corner

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    All about leg and arm coverings to keep you protected in inclement weather.
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