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Castelli Flanders Wind SS Base Layer

One glance at the image of the Flanders Wind Base Layer and you can see it's a purpose-built winner. In short, it's a form fitting base layer with a soft and flexible (and breathable) front wind panel. The Flanders offers up the best chance to keep your core warm from cold and chilly wind as well as inclement weather. Castelli took the time and consideration to make the wind panel nice and soft, so it doesn't feel like you are wearing a stiff and crunchy wind barrier. This is a hurdle for many cycling apparel manufacturers that introduce wind protection into their garments.

The entire body of the Flanders Wind SS is constructed from a multidenier poly fabric that has 3D structure and a rib-knit profile. Let's break that down. Denier is a unit of linear mass of the density of fibers, so multidenier simply means several different densities of fibers. This multiple density construction creates a 3D structure that elevates the fabric off of the skin which greatly improves wicking and moisture management. Rib-knit is the corduroy looking profile of the material that promotes air flow. Castelli combines multidenier 3D fabric with a rib-knit profile for complete success with wicking and moisture management.

The most noticeable feature on the base layer is the black wind panel. Castelli overlays a panel of Gore Windstopper directly on and over the front of the garment for optimal protection from the elements. It allows you to unzip your outer garment(s) if needed, to regulate body temperature. Product designers wisely added perforated poly mesh under the arms for additional venting.

Other details include a 4-needle flat-lock stitching that lies perfectly flat and will not bind. A crew neck profile for added comfort and a flat finish bottom to prevent bunching when tucked into your bottoms. Any rider who enjoys cycling in 3 season conditions should have one of these in their arsenal. Choose your size.


  • Multidenier 3D structure with rib-knit profile body
  • Mechanical wicking
  • Anatomically correct fit
  • Perforated mesh underarms
  • Multicenter poly 4-way stretch sleeves
  • 4-needle flat-lock stitching
  • Crew neck profile
  • Flat finish bottom
  • Longer back stays tucked in
  • A must for all 3 season cyclists

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