Castelli Core Seamless Base Layer Long Sleeve - Black

Castelli Core Seamless Base Layer Long Sleeve - Black Castelli

Castelli Core Seamless Base Layer Long Sleeve - Black

Castelli Core Seamless Base Layer Long Sleeve - Black

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Why Does the Castelli Core Seamless Base Layer Long Sleeve Belong Under Every Jersey?

The Castelli Core Seamless Base Layer Long Sleeve in Black is the foundation layer built for year-round road and gravel riding in cooler conditions. Seamless construction eliminates seam chafing at the shoulders, underarms, and torso that traditional cut-and-sew base layers develop over long rides in an aggressive position, and the snug, body-mapped fit sits flat against the skin without bunching under a jersey or bib. The long sleeve provides full arm coverage for cool mornings and shoulder-season rides where a short-sleeve base leaves your forearms exposed during descents and in the shade.

The moisture-wicking fabric pulls sweat away from the skin efficiently, keeping you dry on hard climbs and breathable during easier efforts. The slim cut works under any jersey without adding visible bulk at the collar or waist, and the flat waistband stays tucked into bibs without rolling. Machine washable in sizes XS through XL, made in Italy, the Core Seamless Long Sleeve in Black is the base layer that disappears under your kit and does its job all day without reminding you it's there.

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$63.99
$63.99 $79.99
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Size: S/M
  • Orders over $100 ship free!
  • Estimated delivery: Aug 10 - Aug 14

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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.

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