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Castelli Mens Core Seamless Short Sleeve Baselayer White
Castelli Mens Core Seamless Short Sleeve Baselayer White
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Castelli Mens Core Seamless Short Sleeve Baselayer 1
Castelli Mens Core Seamless Short Sleeve Baselayer 2

Castelli Men's Core Seamless Short Sleeve Baselayer


Pricing and Order Section

Mfg PartNum:
Save 5%, 10%, or 15% more with purchase of 2, 3, or 4+ closeout items.
SALE: $46.99
MSRP: $79.99
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Core Seamless Base Layer SS

Heading out for your daily ride but find yourself wishing for an extra layer? Keep warm with the breathable and surprisingly lightweight Castelli Men's Core Seamless Short Sleeve Base Layer. This ingenious top is seamless for comfort and surprisingly warm for its weight. This base layer is ideal in cool conditions, providing excellent moisture management. Time to give seamless base layers another try.

Seamless construction promises stretch and comfort. 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 riding, and you freeze when you stop. Castelli has 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. With this top, you'll find the sweet spot that also provides a nice level of warmth for cool to cold days.

The seasons never slow you down, and your kit shouldn't either. That's why Castelli designed the Core Seamless Short-Sleeve Base Layer to keep you warm and dry all year long. The reimagined fabric blend repels moisture so you won't feel like a wet sponge, and the seamless construction will have you pedaling in superior comfort.


  • Short-sleeve base layer for rides in cool weather
  • Technical fabrics wick away perspiration
  • Seamless construction guarantees unrivaled stretch and comfort
  • Fitted design minimizes bunching and chafing
  • Wide neck opening fits under short-collared jerseys
  • Composed of a mix of polypropylene and polyester yarns

  • B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

    Discount Codes are not applicable to Closeouts.

    This product is NOT Eligible for VIP Points.

    Size Chart



    Sleeve Type: Short Sleeve 

    White - S/M

    Mfg PartNum: A20575001-2 

    White - L/XL

    Mfg PartNum: A20575001-4 

    White - 2X-Large

    Mfg PartNum: A20575001-6 


    Ordered by Most Relevant First
    5 stars
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    1 stars
    Reviewed 8/20/2022
    by Anonymous
    portland, oregon
    Overall Rating
    1 of 1 customers found this review helpful.
    Nice but fragile

    On my second use, the fabric tore when putting it on. I�m 135lbs and 5�8� and ordered the small, maybe it wouldn�t have tore If I went up a size. Just disappointed that I only got one use out of before I damaged it. Fabric doesn�t seem very durable.

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    Reviewed 11/8/2021
    by Rick L
    Cycling Enthusiast
    Overall Rating
    2 of 2 customers found this review helpful.
    Great produt, beware sizing is on the small side

    Great baselayer for both warm and cold weather riding.

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