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Castelli Nano Flex 2 Bib Shorts

4.88 Stars 8 Reviews

Size Guide

Castelli Men's Clothing Size Guide
  S M L XL 2XL 3XL
Chest (cm) 92 96 100 105 110 115
Waist (cm) 80 84 88 93 98 103
Hips (cm) 94 98 102 107 112 117
Inseam (cm) 82 83 84 85 86 87


Castelli Shoe Cover Size Guide
  S M L XL 2XL
Men's/Women's EU Size 39-40 41-42 43-44 45-46 47-48


Castelli Men's Socks Size Guide
  S/M L/XL 2XL
Men's Shoe Size (EU) 35-39 40-43 44/47


Castelli Gloves Size Guide
Men/Women <17cm 17-20cm 20-23cm 23-25cm 25-27cm >27cm


Rain or shine

In dry conditions our Nano Flex fabric is stretchy, breathable and warm thanks to its softly fleeced inner face. But in wet conditions the nanotechnology water-repellent surface keeps much of the moisture at bay. There is no membrane to block breathability, though, so in harder rain or on longer rides some moisture will come through. But that’s when this fabric is at its best: it never feels waterlogged, it almost feels dry on your legs, and best of all it continues to keep you warm. If you’re going to do serious rain riding, you should look to our Nano Flex Pro Bibtight, or even the Tempesta Pant, but for lighter rain, warmer temps or wet roads this will be ideal.


  • Nano Flex fabric provides outstanding warmth and stretch with water resistance
  • Minimal seams for maximum water resistance
  • KISS Air seat pad for all-day comfort
  • Mesh bib straps for breathability
  • Reflective screen-printed Castelli graphic on both legs


  • Windproofness
  • Waterproofness
  • Insulation
  • Breathability
  • Lightweight
All-Weather Protection

How long will it take to arrive?

Please check the stock availability notice on your item when placing your order. This item is: .

How will I know it has been sent?

You will receive an email to confirm when your item has been sent.

You can also check the status of your order and individual items by accessing My Account details and following the prompts.

Please allow 10 working days from dispatch of your order before notifying us of any late deliveries.

It may be advisable to check with your neighbours to see if a parcel has been left with them, check any outhouses you might have where it may be left if it cannot fit through your letterbox and contact your local sorting office to see if the item has been returned to the depot as undelivered and awaiting collection.

If I'm not completely happy with my item?

Please see our returns policy.

Customer Reviews


8 Reviews

5 Stars 7
4 Stars 1
3 Stars 0
2 Stars 0
1 Stars 0

Top Customer Reviews

Where reviews refer to foods or cosmetic products, results may vary from person to person. Customer reviews are independent and do not represent the views of The Hut Group.


Like all Castelli products, it is a quality product that is just as advertised. I haven’t worn them in rain as yet but in persistent drizzle I stayed dry and warm. The fabric feels good against the skin and I felt toasty warm in Melbourne’s winter conditions.


These are terrific. Comfy fit, great chamois and, most importantly, feel warm. Excellent to use on cold days. I generally use them when the weather goes below 15deg C.

best thermal bib shorts

The Castelli Nano Flex 2 are the best winter bib shorts I've used and superb value for the price. The fabric is warm, reasonably water resistant and offers a good balance between stretch and support. They're good and long in the leg, giving an extra inch or two of coverage with a comfortably grippy hem that stays in place. The waist is also higher than on regular bib shorts for extra body warmth. Only downside is that the reflective logos aren't that durable - not unusual on bib shorts - but it's a small negative. Overall 5/5 for performance, fit and value.

Good quality shorts

Good shorts, great in combination with the nano flex leg warmers. Wore them on a chilly winters day and didn’t feel the cold. I recommend one size larger than normal.


These bibs are very comfortable in normal conditions. The legs are a bit longer and the fabric is very stretchy. My first ride was in the pooring rain with temperatures around 5 C. Halfway the three and half hour ride I was soaked and very cold. I had the nanoflex arm- and legwarmers too and a gabba jersey. Still very cold. I expected a bit more rain protection. Second ride was in dry conditions around 12 to 15 C. This was very comfortable and not too warm.

Pretty good Bibshorts

I'm 5'-6" & 120 lbs, the SMALL bibshorts are the same length as Castelli Endurance x2 (longer than Castelli Free Aero Race bibshorts by one inch). The padding, KISS+air is just as good as Progetto X2. The NanoFlex2 bibshorts is not as tight as the Free Aero Race bibshorts. The Castelli text (both legs) is a reflective ink and is not rubberized (probably will not peel or crack). The NanoFlex fabric was blemish free. I wore the shorts with merino baselayer + Gabba SS + NanoFlex Arm & Kneewarmers in dry 7 degree celsius weather. Nice & warm, with very little sweating. Washed the NanoFlex bibshorts with Purex, Free & Clear liquid detergent.

Just comfort

I bought another pair after receiving and putting the first through my test program. They do exactly what Castelli say and I don't need 3/4 legs as these bit shorts kept my muscles warm. Great product! Delivery to Australia was outside the specified time.

Typical Castelli quality

These bibs are a similar size to my other Castelli bib shorts (M size) but they are a bit longer in the leg, which you'd expect for cooler weather clothing. I've ridden them on a 5°C morning and they were perfect but did feel a bit warm at the end of the ride when the temperature was 15°C (but not uncomfortably so). I'd say these are good to about 0°C (with knee warmers) for fast group rides.