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Castelli Gregge 15 Sock


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  • Black/Giro Pink, S/M
  • Black/Giro Pink, XXL
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  • Dark Gray Orange, XXL
  • Red Savile Blue, L/XL
  • Red Savile Blue, XXL
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  • Black/Giro Pink, L/XL
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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
  • Item #CST00J4

70% merino wool, 15% nylon, 15% elastane
Recommended Use
road cycling
Manufacturer Warranty
1 year

Tech Specs

What do you think about this product?


>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.