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  • Castelli - Thermoflex Arm Warmer - Black
    Castelli - Thermoflex Arm Warmer - Side
Castelli - Thermoflex Arm Warmer

Castelli Thermoflex Arm Warmer

35% Off
$25.99 $39.95

Item #CST00GM


Tech Specs

Thermoflex fleece
Claimed Weight:
[pair] 67g
Recommended Use:
Manufacturer Warranty:
1 year

No more goosebumps.

Cold arms are uncomfortable and distracting when you're pushing through a cool shoulder-season ride, but it's an easy problem to fix. Slide on the Castelli Thermoflex Arm Warmer before you head out on a crisp day, and the microfleece-lined thermal fabric will hold heat next to your arms while remaining breathable if you break a sweat. Features like a comfortable cross-wrap at the wrist and silicone gripper promise to keep fit issues at bay so you can put each warmer on and go ride free of distraction.

  • Insulate your arms on chilly days with this plush warmer
  • Thermoflex fleece holds heat close but remains breathable
  • Silicone gripper prevents slippage and drooping
  • Cross-wrap cuff creates a comfortable fit at your wrists

Pleased with these 😊

  • Familiarity: I've used it several times
  • Fit: True to size
  • Size Bought: Medium

This is my first pair of arm warmers and they have worked perfectly. I am very satisfied with the fit and the comfort of these.

image not exactly the same

  • Fit: True to size

These arm warmers are very nice and great quality. One of the sleeves has a quarter sized red image on it. I needed completely black sleeves to fit race requirements so I needed to return them. I also ordered the size not thinking that they were sized for men. Otherwise, they would have been perfect.

Awesome product

    Very awesome product , they perform very well 60 miles ride , between 40 and 50 Fahrenheit with a long base layer under , not problem at all on my arms .

    good quality, sized very small

    • Familiarity: I returned this product before using it
    • Fit: Runs small

    Well made. I am a slender woman with thin arms and the medium was too tight. Will exchange for the large

    These work well.

    • Fit: True to size
    • Size Bought: XL

    I have worn these down to 40 degrees with consistent winds - they have kept me warm and are do not move or slip.

    Best arm warmers around

    • Familiarity: I've put it through the wringer
    • Fit: True to size
    • Size Bought: XL

    Needed to replace my arm warmers and opted for the Castelli Thermoflex version. I'm basically a standard XL in everything Castelli and the arm warmers fit perfectly. This version is quite nice due to the rubber grippers on the inside and outside of the top of the warmer and the "cuff" at the bottom that I feel improves the comfort and fit - and the micro fleece, red lined interior on the cuffs is a nice touch. I have long arms and the XL basically goes from the top of my arm to my wrist for full coverage. I tried the L on to see how the fit would be and could not get it over my elbows. The only other info I'd like to add if you are reading this is to not wear arm warmers with sleeveless jerseys or tank tops, unless you are trying to make other people laugh intentionally. Bottom line is if you get the right fit on these arm warmers, you won't be disappointed with the quality and durability.

    Love it

    • Familiarity: I've put it through the wringer

    Very comfortable. Ive been commuting for the past year and they have taken a pounding and they still get the job done.

    Runs very small

    • Fit: Runs small
    • Size Bought: XL

    I am 6'0" 190 lbs with average size arms. I first ordered the L and could barely get it on. It was even tight on my wife, who weighs 125 lbs. I then tried the XL which was still tight on me. I'd think Castelli could give biceps size in their sizing chart, everything else is a waste of time. If you order anything from Castelli, from my experience with their products, order up at least TWO sizes from your usual size, and keep your fingers crossed.

    Next Generation

    • Familiarity: I've used it several times

    Upgraded to these as my go to road arm warmers and fulfilled my Castelli expectations. Thermoflex is super soft and flexible while moving with you during rides, etc. The new cross cut cuff offers a nice smooth and unrestricted closure. As opposed to the Nano Flex version, these are much more elastic and conform to your arms much closer. This can be attributed to the lack of the water-resistance treatment that the Nano Flex versions receive. Fit is Castelli- race fit as expected. My arms are somewhat long without bulk and I opted for medium for a 6'2" rider.

    Hi, can you tell me what you mean by "cross cut" cuff? They talk about this in the specs too and I don't know what that means and can't tell from the photo. Is there some sort of strap on the bottoms, or are these just normal arm warmers? Also, are these heavy fleece lined, or light? Thanks!

    Very nice - but not for big guns

    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: Runs small
    • Size Bought: Large

    I have the Thermoflex knee warmers and got these to match. I haven't ridden them in temps below 50 degrees yet, but they seem plenty warm and are comfortable. No falling down at all. I've got long skinny arms, and they're pretty snug and long. I pull them up to my armpits and still go down over my wrists. It works for me, but caution if you've got big or thick arms.

    They do the trick!

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

    These are a good value and definitely do the trick. Temps dropped today and the arm warmers worked great. These are well made and have a good weight fabric. Inside the sleeves is a nice soft low fleece type backing; comfy. More insulating than your typical lightweight SPF type warmers. I bought a size Medium and they fit well.

    Castelli Arm Warmers

    • Familiarity: I've used it several times
    • Fit: True to size
    • Size Bought: Medium

    It works for me. Very warm! The only cons is that the strap is a little tight and I have thiny arm, but it is bearable.

    Hi, I'm 5'8, 145 lbs and was going to get a size small. The medium works for you?

    Yes man, Medium is for you.

    AM - unless you have skinny arms, consider the L. Especially if you ever put the arm warmer over even a thin base layer. The
    L is even tight on my wife who weighs 125 lbs.


    Arm & Knee Warmers





    Rider Weight

    99.2 - 132.3lb

    (45 - 60kg)

    99.2 - 132.3lb

    (45 - 60kg)

    132.3 - 154.3lb

    (60 - 70kg)

    154.3 - 176.4lb

    (70 - 80kg)



    Short/Jersey Size XS - S S - M S - M L - XL 2XL - 3XL
    Short/Jersey Size:
    Take your typical cycling short or bib sizing for comparison.