Home Page

Cart, contains 0 items

When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures.
Expert Help
Earn Rewards
  • Just In
  • Learn

Core Seamless Long-Sleeve Base Layer - Men's

3 out of 5 stars
1 Review
Current price: $63.74 Original price: $84.99
25% off


Size Chart


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

Overall Rating

3 based on 1 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 1 reviews
4 Stars - 0 reviews
5 Stars - 0 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


Selecting an option will reload the available reviews on the page
3 out of 5 stars

December 16, 2020

Baseline baselayer

I've used it once or twice and have initial impressions
Size Bought:
5' 9"

It's a very comfortable and warm base layer. I say baseline because for the price the sleeve around the wrist could have been a little tighter which would be inline with the rest of the fit of the garment. The size runs true to the sizing which I typically wear med (eliel, velocio, ornot etc) but in castelli and gore I wear a large.