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On days considered more cool than cold, a short sleeve base layer is all you need to give yourself an extra layer of warmth without having to worry about the added bulk of a vest or jacket. The company’s softest base layer to date, the Castelli Iride Seamless Short Sleeve Base Layer uses a new state-of-the art seamless knitting technology and a moisture-wicking blend of polypropylene, nylon, and lycra to keep your core warm while wicking moisture away from your skin.

A popular choice for performance base layers, polypropylene quickly transports moisture away from your skin. At this point, the Iride’s nylon layer takes over, transferring moisture outward where it evaporates, keeping you warm and dry. The Iride is also cut long at the waist to keep the base layer from riding up and out of your bibs.

The Castelli Iride Seamless Short Sleeve Base Layer is available in Black and comes in three sizes -- Small/Medium, Large/X-Large, and XX-Large. Like most Castelli clothing, the Iride base layer is designed to be form-fitting as the technical fabrics used to construct the garment work best when in close contact with your body. Be sure to check the sizing chart to ensure proper fit.

  • Seamless construction for comfort and no seam-to-seam rubbing
  • Texturized polypropylene fabric rapidly wicks moisture away from the skin

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Here's what others have to say...


Nice base layer!

  • Familiarity:I've used it several times

When I first received this I thought there was no way it was going to fit a grown man. I ordered Large and when I pulled it out of the box it appeared to be appropriately sized for my eight year old son. But with a couple small pulls it was on and fit just perfectly. Great compression and holds in that little extra heat on cooler days. Very comfortable and non-restrictive. I love it. Definitely recommend this one!

I am 5'11" 167lbs and Large is spot on.


Compression shirt, not as web described

  • Familiarity:I returned this product before using it
  • Fit:Runs small

It is polyester, not polypropylene as described, and on the box labeled compression. It is the same size, (xxl) as Castelli Airco Base Layer - I bought last year, but almost 2" narrower on upper chest laid on top of Airco, which is mostly Nylon (82% and 12% poly) which holds in heat better for winter.

This would be ok compression but I have a torn rotator cuff. Fit and finish and general workmanship is very good.

I wound up returning as couldn't use.

I have 44" chest, 32 waist, 5'9, 164. Use xxl castelli, esp. jacket, can get away with xl jersey. Lg in Pearl Isumi, Usual cut diff. for mfg's.

5 star for quality, bad web description though.


Good base layer

    Nice base layer. Not sure it cools or warms you any better than a Castelli similar product at half the price. Very comfortable and form fitting, which is appreciated.