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The Castelli Nano Flex Pro Omloop Bib Shorts use Nano Flex fabric, which has a warm brushed fleece on the inside and an outer nanotechnology water-repellent surface treatment. This fabric makes much of the rain run off the fabric and when it does eventually wet out it manages to keep you warmer. They're also equipped with the Progetto X2 Air seat pad, which confirms that this product is meant for pro duty.

Although these are just a few centimetres longer than standard bib shorts, finishing just above the knee, you’ll be amazed at how much warmer they feel. They also feature raw-cut edges tapered just right for extra coverage in the front while being shorter on the back so they don’t bunch up behind the knee.


  • Material: Castelli Nano Flex Fabric
  • Minimal seams for maximum water resistance
  • Progetto X2 Air seat pad
  • Mesh bib straps
  • Pro-length cut just above the knee
  • Raw-cut edges
  • Screen-printed logos
  • Temperature Range: 12°-18°C
  • Weight: 214g

Delivery Information

Hargroves Cycles offer Free Delivery for all orders over £9 with in Mainland UK (orders below £9 will be charged £1.99)

Bikes and Bulky items are sent via TNT Courier and smaller items are sent via Royal Mail 2nd Class Post.

Items over £50 are sent with Royal Mail 1st Class track able service which is emailed to the customer on the day of dispatch.
For full delivery details please see our Delivery Page

International Delivery

Hargroves Cycles delivery all across Europe. Goods are shipped from the UK and are subject to import duties where applicable

For further delivery, pricing and restriction information please view our International Shipping Page

Returns Information

We will happily exchange or refund any item purchased at Hargroves Cycles within 365 days, except gift vouchers and personalized products, except where faulty.

Returned goods must be unused and supplied with their original packaging, unless faulty.

For full details on our Returns procedure please visit out Returns Section.

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After a brief but promising cycling career, Maurizio created his eponymous brand in 1974 and a series of firsts would follow: the first Lycra shorts used in racing and sold to the public, the first colored shorts, the first sublimation printed jerseys, the first synthetic winter clothing, the first use of windproof membranes, the first hydrophilic fabric treatments, the first anatomic seatpad, the lightest jersey ever produced, and the most aerodynamic jersey ever produced. Maurizio’s vision was to be at the forefront of technology, performance and design. Maurizio Castelli died in 1995 while cycling up the Cipressa climb, the next-to-last hill in the Milano-San Remo course.

Today, Castelli is dedicated to continuing Maurizio’s dream: to create the most innovative clothing for the cyclist seeking maximum performance.