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Specifications

  • Construction: Seamless body-mapped knit
  • Sleeve: Long sleeve
  • Fabric: Moisture-wicking
  • Colorway: Black
  • Sizing: XS, S, M, L, XL
  • Care: Machine washable
  • Origin: Made in Italy

FAQ

What is the difference between the Core Seamless and the Pro Mesh base layers?

The Core Seamless uses a solid knit for a warmer, more protective feel in cool conditions. The Pro Mesh uses an open mesh structure for maximum ventilation in warm conditions. Choose Core Seamless for cooler rides and Pro Mesh for hot summer training.

Should I size up for the Core Seamless base layer?

Castelli base layers run true to size and are designed to fit snugly. If you are between sizes, sizing up is reasonable to avoid a too-tight feel, particularly across the chest and shoulders.

Does seamless construction actually make a difference on long rides?

Yes. Traditional seams at the shoulders and underarms create friction points that become irritating over hours on the bike, especially when leaning forward. Seamless construction eliminates those contact points entirely.

Best For

Road and gravel cyclists who need a seam-free long-sleeve base layer for cool-weather training and shoulder-season rides under any jersey.

Castelli Core Seamless Base Layer Long Sleeve - Black Reviews:

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