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CastelliGregge 15 Sock


Item # CST00J4

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Item # CST00J4

Gregge 15 Sock

Your rides run the gauntlet from too warm to too cold, and you don't shy away from your bike because of a little drizzle. The Castelli Gregge 15 Sock is constructed of a merino wool blend that naturally regulates temperature and manages moisture—standing up to both perspiration and precipitation. The blend is soft and flexible, and it's constructed with a reinforced toe and heel for extra durability. A thicker footbed cushions your foot against the stiffness of your shoe and improves warmth retention to minimize chills.
  • Cycling socks for all weather conditions
  • Merino wool blend is soft and manages moisture
  • Thicker footbed improves warmth retention
  • Reinforced toe and heel enhance durability
  • Crew height provides coverage

Tech Specs
Material70% merino wool, 15% nylon, 15% elastane
Recommended Useroad cycling
Manufacturer Warranty1 year


US MEN'S SHOE SIZE 5 - 6.5 7 - 10 10.5 - 13
EU MEN'S SHOE SIZE 36 - 39 40 - 43 44 - 47
US WOMEN'S SHOE SIZE 4 - 7.5 8 - 10.5  
EU WOMEN'S SHOE SIZE 35 - 38 39 - 41  

What do you think about this product?


>Rating: 5

Great All Weather Socks

I've used it several times
True to size
Size Bought
6` 3"
210 lbs

The Castelli Gregge 15 socks are great. I purchased two pair and they have performed really well so far. I wear a size 45 EU/11.5 US and the XXL was the perfect size for me. The are comfortable and fit nicely.

>Rating: 5


Runs small

Castelli socks are iconic in the cycling world. Made in Italy, these socks are a work of art. The quality is 10 out of 10. I own several pairs of Gregge 15 and Castelli Quindici (15) wool socks. Love them both. The only difference I can tell is that the color schemes are different. Castelli officially rates them both for use in 60° F down to freezing weather (with shoe covers!). Sizing: The sizing chart at the official Castelli website is correct. Cycling shoe size: 36-39 = S/M Cycling shoe size: 40-43 = L/XL Cycling shoe size: 44-47 = 2XL I wear a 45 in Shimano. The 2XL fit perfect -especially after a few washings (wool does shrink a little). If you wear a size 45+ cycling shoe, definitely buy the 2XL.

>Rating: 4

Nice sock for colder weather

I've put it through the wringer
True to size

I bought these socks when I was buying several pairs at the begining of the riding season. These are great, a little on the thicker side so I like them on cooler days. Stay up well and super comfortable.