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Core Seamless Long-Sleeve Base Layer - Men's

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Core Seamless Long-Sleeve Base Layer

As a warmer and arguably more comfortable alternative to their well-placed and beloved Prosecco Tech base layer, the Castelli Core Seamless Long-Sleeve Base Layer is well…seamless. The soft and synthetic blended fabric form-fits to comfort and work under more substantial winter riding jackets. Castelli provides the Core with exceptional wicking power and warmth, and it's rated to perform down to 39 degrees F — a four degree reach lower than the Prosecco Tech. A lighter weight weave is used on the side and the back to provide uniform insulation when considering you'll tuck this under bib straps that have a certain level of insulation built into them. And for those who are part of the gram-watcher club, The Core does register 43 more grams on the scale than the Prosecco, which may help in determining which Castelli layer best suits your goals.


  • Castelli's seamless long-sleeve base layer for cool to cold riding conditions
  • Synthetic blend fits close to body and works well with winter jackets
  • Lighter weight construction on sides and back for enhanced comfort
  • Wide neck hides away from jersey collars to remain unseen
  • Rate for efforts outside in 39-61 degrees F
  • Item #CSTZ7CW
84% polyester, 16% polpropolyene
Claimed Weight
[large] 6.8oz
Manufacturer Warranty
1 year

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