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Men's Nano Flex Pro Omloop Bib Shorts

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Pro Level Style and Support.

The Men’s Nano Flex Pro Omloop Bib Shorts from Castelli offer pro-level style and support with their extended knee hem. Although it’s only a few centimeters longer, the additional length delivers noticeable benefits in terms of warmth and, of course, style. On the front side, the hem reaches down nearly to the top of the knee cap. Around the backside, the hem curves upwards to prevent bunching. Made primarily from Nano Flex, a flexible, fleece-based fabric with a hydrophilic finish, these bibs are largely waterproof in light rainy conditions, forcing droplets to remain at the surface where they evaporate or bounce off. In steady rain, water eventually seeps through but the insulating properties of Nano Flex maintain warmth so you may get wet but not cold.

For sustained comfort in the saddle, these bib tights come with Castelli’s Progetto X2 Air seat pad. The top layer is seamless with an anti-microbial treatment and four-way stretch. It's breathable, as well, to regulate temperature and moisture. The sensitive ischial and perineal zones feature perforated viscous padding to ensure adequate support. Multi-density foam throughout the rest of the chamois ensures comprehensive support.


  • Water-repellant & insulating Nano Flex.
  • Progetto X2 Air seat pad.
  • Pro-length hem.
  • Raw-cut hem without silicone/elastic for maximum comfort.
  • Tapered hem prevents behind-knee bunching.

Progetto X2 Air Details:

  • Seamless, air flow top layer.
  • Four-way stretch
  • Bacteriostatic treatment.
  • Multi-density foam of variable thickness.
  • Perforated viscous padding at ischial & perineal zones.

Style Type: with Bib 

Ordered by Most Relevant First
5 stars
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1 stars
So good
by Sono mio

Excellent thermal bibs. The right length and fit, great pad and placement of pad. Water beads in light rain or wheel spray. Pairs well with knee or leg warmers and a Grenache.

Reviewed 6/18/2018
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Love 'Em
by CornHolyO
Cycling Enthusiast

They work exactly as described. Great on cool, damp rides, but not as restrictive as knickers or tights. If it starts to warm up, you're still comfortable and don't get too hot. Great chamois and fit, just size up one size as they are the typical Castelli fit.

Reviewed 12/1/2017
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