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Pro Seamless 2 Arm Warmer

5 out of 5 stars
4 Reviews
Color:Belgian Blue


Size Chart


Why We Like The Pro Seamless 2 Arm Warmer

When we can't decide on a long-sleeve jersey or not, we simply pull on the Pro Seamless 2 Arm Warmer and get moving. This arm warmer from Castelli lets us control our temperature easily and transition between layers in seconds. It features the ideal balance between warmth and lightness and provides enough warmth to keep us moving through chilly days. When the sun decides to poke out from behind the clouds, we can easily stow away our arm warmer in our jersey pocket and carry on.


  • Arm warmers that keep us riding through shoulder seasons
  • Midweight for warmth and easy to take on and off
  • Pro-level fabrics offer moisture-wicking capabilities
  • Easy enough to slip off and stow in our jersey pocket
  • Highly breathable for when we heat up
  • Item #CSTZ7J8
78% polyester, 15% nylon, 7% Lycra
road cycling
Manufacturer Warranty
1 year

Overall Rating

5 based on 4 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 0 reviews
5 Stars - 4 reviews

Fits Slightly Small

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

June 27, 2024

Excellent spring equipment

I've used it several times
Size Bought:

The sizing is typically euro, always on the small side of things but if you know to purchase the next size up that you would normally wear you'll be happy. Castelli quality is always great.

5 out of 5 stars

April 16, 2024

Nice mid-weight arm warmer

I've used it several times
Size Bought:

Really like these mid-weight arm warmers. They are in between my arm coolers and my heavier arm warmers. They are comfortable and form fitting. I bought medium and usually wear medium and they were perfect.

5 out of 5 stars

September 14, 2023


I've put it through the wringer
Size Bought:
6' 2"

Great fit, Great feel. Great look. Need I say more?

yle106688753 y
5 out of 5 stars

September 18, 2021

Fantastic, but size up.

I've used it once or twice and have initial impressions
Size Bought:

Great warmers. Probably my favorite ones over 20+ years on the bike. I'm 6' and 155# and wasn't sure about the sizing - S/M seemed like it might be too small but L/XL definitely seemed like it'd be too big. I ordered both knowing I can just send one back and the L/XL fit great. Length was perfect and the fit was tight. I don't have toothpick arms but they're not exactly big, either. Sizing might be a problem for guys/gals with bigger arms.