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Castelli Lycra Arm Warmers

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Item # CST0107

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Item # CST0107


Wear the Castelli Lycra Arm Warmer for extra coverage on cool-weather rides. Besides supporting your muscles, Lycra 29 fabric provides excellent sun protection, plus durable stretch and return. The heat-transferred forearm scorpion logo adds style points.

  • Note: Black is Men's, White is Unisex and fits 1/2 size smaller.

  • Affinity Lycra
  • Provide excellent muscle support
  • UV protection
  • Aerodynamic fit

Tech Specs

Recommended Use:

Size chart


Arm and Knee Warmers
Rider Weight 99.2 - 132.3lbs
(45 - 60kg)
132.3 - 154.3lbs
(60 - 70kg)
154.3 - 176.4lbs
(70 - 80kg)
Short Size XS - M S - M L - XL 2XL - 3XL
Short Size:
Take your typically cycling short or bib sizing for comparison.

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Here's what others have to say...

Unanswered Question

I'm looking for the Castelli Lycra Arm Warmers white S.

Do you have this item in stock?

Avg. ride time: 1h 54m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Good for sun

  • Familiarity:I've used it once or twice and have initial impressions
  • Fit:True to size

Pretty thin and somewhat water-resistant. Good for if you want to avoid a sunburn, but the weathers to hot.



    Just Lycra, no insulation -perfect for 60+ degree days. (Same goes for the knee) warmer. Just a light layer of insulation. The arm grippers are sticky as well.

    do you have to buy each arm / leg warmer...

    do you have to buy each arm / leg warmer separately?

    Responded on

    Hi Bob - they are sold either as a pair of arm warmers or a pair of leg or knee warmers.


    Great weight

      I have owned these for almost a year. I originally bought them for summer protection, but I wore them most of the winter too and down to temps in the low 50's and they are great. I have since purchased the fleece lined castelli arm warmer and I still prefer these. I wear L jersey and got the L size and they are perfect.


      Arm protection from the Sun

        The white arm sleeves are just right to keep the sun from burning your arms mid-day. They are not noticeably warm on a hot day, yet do provide some warmth on a cool day. Also good for around town motorbike use, and other packable layering applications.

        At first the medium size seemed too tight on the upper arm, but after a few rides they are a good fit and don't slip.

        Avg. ride time: 2h 25m per week
        • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

        Great basic warmers for cool temps

          These warmers are very basic and are designed only to take the edge off of cool temps in the 50s. Since this is what I got them for, they are perfect. Very snug and not too hot.


          Good fit but too thin--useless

            These fit great--I'm 6'2", if that helps--but they're so thin and lacking any insulation that they're basically useless. Seriously, they don't really provide any warmth against the cool air. Better off using nothing.


            Castelli Lycra Arm Warmer (white)

              Perfect for chilly mornings in the late Spring or even to avoid sun in the Summer. I prefer lycra with no fleece insulation. Works very well and stays on arm throughout ride.

              Responded on

              The white is "unisex" and the black is "mens". They fit slightly different from each other and is not advised to mix and match as it will appear uneven.