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Castelli  |  SKU: CLCJB0575010-LXL

Castelli Core Seamless SS Baselayer Men's

$109.90

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Easy Returns

We accept returns on most products (except chamois pants, bikes, nutrition items, clearance or end of line items, and other items that cannot be resold for hygiene reasons).

Returns are accepted within 30 days of purchase, provided the products are unused, in their original condition, with packaging intact, and tags still attached.

Please note that returns are subject to management discretion.

Shipping costs for returns are the responsibility of the customer, and shipping fees are non-refundable.

For our Full Returns Policy please head to our returns page: Returns Policy

Seamless for comfort and surprisingly warm for its weight, this base layer is ideal in cool conditions, providing excellent moisture management.


Product features



  • 84% polyester / 16% polypropylene yarns provide soft, warm wicking and exceptional stretch fit

  • Seamless construction means extra comfort

  • Lighter weight on side and back

  • Wide neck opening to fit under short-collared jerseys


Technical Features



  • Insulation: 4/5

  • Waterproofness: 1/5

  • Windproofness: 1/5

  • Breathability: 4/5

  • Lightness: 4/5



  • Weight: 151gm

  • Temperature: 8°C - 20°C / 46°F - 68°F

  • Fit: Regular


Time to give seamless base layers another try. Seamless construction promises stretch and comfort, but most base layers on the market have a nylon and Lycra® mix that feels comfortable when you put it on but then ends up feeling wet when you're actually riding, and you freeze when you stop. We've worked hard to make this Core Seamless base layer keep you warm and dry, thanks to the addition of polypropylene and polyester yarns, while not compromising the stretch comfort of seamless. We think we've found the sweet spot that also provides a nice level of warmth for cool to cold days.