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Men's Flanders Warm Long Sleeve Baselayer

Mfg PartNum:
  (7 customer reviews)
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No shivering on the cobbles.

Riding Belgium in the spring might bring the shakes, whether from the rough cobbled roads or nervous anticipation of an upcoming muur, but it certainly won't be from the cold getting through your Castelli Men's Flanders Warm Long Sleeve Baselayer. Designed with a SottoZero high-loft fleece interior, you'll be insulated by luxuriously soft fibers against the skin that also do an excellent job of wicking moisture to keep you dry. Mesh underarms further aid in ventilation, and its stretchy fit with flat hem means it layers well underneath a jersey or jacket while staying in place with the bottom tucked into your bibs.

Flatlock seams.

Note: Castelli tops and bottoms are designed with a performance cut that often runs smaller than that of other manufacturers. Consider sizing-up one size to ensure a comfortable fit — e.g., if you normally wear a Medium, select a Large in Castelli. Feel free to contact us with any questions or concerns.

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.


Sleeve Type: Long Sleeve 

Grey- Small

Mfg PartNum: A14531008-2 


Mfg PartNum: A14531008-3 


Mfg PartNum: A14531008-4 


Mfg PartNum: A14531008-5 


Mfg PartNum: A14531008-6 

Black - Small

Mfg PartNum: A14531010-2 

Black - Medium

Mfg PartNum: A14531010-3 

Black - Large

Mfg PartNum: A14531010-4 

Black - X-Large

Mfg PartNum: A14531010-5 

Black - 2X-Large

Mfg PartNum: A14531010-6 

Ordered by Most Relevant First
5 stars
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1 stars
Well fitting, soft and comfortable. Follow the mfr instructions and don't put in the dryer like another reviewer did!
by Sheriff
Cycling Enthusiast
Spokane, WA

I'm 6'3" 195 lbs. 32" waist with a swimmer build, 44 chest. The base layer is a form fitting trim up, so no big bunches of fabric plus it is long enough to not be short to your waist. The XL fits me perfect, the sleeves nice and long plus the low cut mock turtle neck doesn't get in the way of tall collared jackets or jerseys.

Just right for a single layer under a long sleeve jersey in 50 degree F weather or add a midlayer vest as the temp drops.

Note, read the care instruction tags for your garment if you want it to last a long time,

DO NOT DRY IN THE DRIER! They will tell you to not put in the dryer. It dries really fast just hanging, I washed it at noon after a ride and it was dry by the next morning for another ride. I air dry all my cycle gear expect my socks.

Reviewed 1/18/2021
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Great baselayer for colder temps!
by Anonymous
Cycling Enthusiast
Cleveland, OH

This Castelli Flanders baselayer was great for cycling in the colder temperatures around here. I used this with a short sleeved jersey and and LG insulated jacket and was plenty warm down to 38 degrees, assuming the usual accessories for warmth. It's comfortable against the skin and isn't overly constrictive for fit, but definitely form fitting like most of the Castelli gear.

Reviewed 6/19/2020
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Great Winter Base Layer
by Anonymous
Cycling Enthusiast

This is the best winter base layer I've ever had. Wicks sweat away from your body so you don't get too cold. Comfy fit. Good underarm ventilation.

Reviewed 4/6/2020
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Warm and wicks well
by Anonymous
Southern California
1 of 1 customers found this review helpful.

Keep your upper body comfortable and moisture free with this one. Supper comfortable and a great addition for the under 45 degree rides.

Reviewed 1/26/2017
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Good but neck is too tight
by woodcraft
Cycling Enthusiast

This is comfortable for winter rides, once it is in place.

So far the shirt has not ripped, nor my ears been torn off,

but those seem possible every time it is put on or removed.

Size large shirt, 7 hat size. Maybe Italians have very small heads.

Reviewed 1/2/2017
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Most comfortable base layer I have.
by SonomaCyclist
Cycling Enthusiast
Sonoma County

Incredibly comfortable under a cycling jacket, it serves its warming purpose without eventually producing the dampness that can lead to a chill at the end of rides. The ventilated underarms and sides work really well while being soft and comfortable.

Reviewed 6/4/2018
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Needs a longer cut
by Rob
1 of 2 customers found this review helpful.

Material was comfortable enough, but like the Craft Base later much better because it much further below the waist

Reviewed 2/23/2018
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