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CastelliNanoflex Donna Tights - Women's
Sale 40% Off$59.97 $99.95

Item # CST009G

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Item # CST009G

Nanoflex Donna Tights

You can resist giving up your favorite pair of bib shorts for a few weeks, or maybe a month or two of fall, but eventually, your legs are going to need some more protection. If you want a one-piece solution to keeping your lower half warm during cold-weather cycling, Castelli's Nanoflex Donna Tights represent a sleek, highly functional choice. They have a built-in KISS Air Chamois so you won't need to deal with layering, and they are constructed with Castelli's Nano Flex fabric, which wicks moisture quickly away from your skin to manage body temperature. Water beads up and rolls off immediately when it hits Nano Flex, so you won't need a shell with these tights if you're heading out on a day with threatening skies, and Castelli used as little seaming as possible to eliminate areas where water could get into the tights.

Castelli shows its continuous attention to the small details that contribute to a piece of clothing's functionality as well, using Giro3 ankle grippers to create seamless, sealed integration with your shoe covers, and including ankle zippers that make it easy to put the tights on or take them off. As a final touch, reflective accents on both the zippers and the sides of the legs help enhance your visibility as you try to pedal home before those early winter sunsets.

  • Nano Flex fabric offers warmth, stretch, and water resistance
  • Soft against the skin and breathable so you don't overheat
  • Minimal seams reduce irritation and offer maximum water resistance
  • KISS Air Donna chamois provides long mile comfort
  • YKK ankle Camlock zippers allow for easy entry and exit
  • Reflective tape at ankles increase visibility in low light
Tech SpecsSize
Tech Specs
Nano Flex
KISS Air Donna
Recommended Use
Manufacturer Warranty
1 year


Women's Apparel












































Note: Castelli has a "Euro" slimmer fit. We suggest ordering at least one size larger than your normal US size.
How to Measure:
For best results, take measurements over your underwear.
Measure under your arms, around the fullest part of your chest.
Natural Waist:
Measure around your natural waistline, keeping the tape a bit loose.
Measure around the fullest part of your body at the top of your legs.
Using pants that fit well, measure the crotch seam to the bottom of the leg.

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Way too small

  • Familiarity: I've used it once or twice and have initial impressions

Wear a medium in Pearl Izumi and almost all other brands. The size large in the Donna tights was impossibly small. In fact, gave them to my 13 year old mountain bike racing daughter and they fit her perfectly.

Buy these!

  • Familiarity: I've used it once or twice and have initial impressions

I used them in winter weather for entire day riding. Perfect padding and comfort.

Awesome fit and comfort

  • Familiarity: I've put it through the wringer

Love these tights. Great fit, ordered a size up from street size. Keeps me warm in 30 degree temps and is has good waterproof capabilities. Like the clingy ness of the ankles and the tight zipper. The waistline is a stylish ‘v’ and the padding is awesome. Loved this brand so much bought hubby same in men’s.

Great tight for the price

  • Familiarity: I've used it several times
  • Fit: True to size
  • Size Bought: medium

The tights are warm and well made. The medium is a little tight in the waist...but I don't have a waist! I think a size large would have been too large elsewhere, though I am aware of the waistband when I ride.

I like the tight but way too small

  • Fit: Runs small

I always wear a medium but these are very small - will exchange for the next size up.

Too Small

  • Fit: Runs small

I ordered a medium - I'm 5'6 130lbs and usually always a M. Nice pant but I will try to size up.


    This pants keep me warm through the winter cycling. It’s made with good quality of materials. I will shop it again.

    Great tights!

    • Familiarity: I've used it several times

    I have two pairs of the Donna shorts and love them, and the tights are no different! The sizing is a bit tighter than the Donna shorts, but not so tight I needed to go up another size. They are the perfect combination of warm and breathable. I haven't worn them in the rain yet, but they are great for dry cold weather riding.

    Warm and breathable

    • Familiarity: I've used it several times
    • Fit: Runs small
    • Size Bought: Medium

    Medium fits great-a little long but that means they cover to the top of my shoes. Chamois is extremely comfortable on the bike and yes, it feels a little bulky off the bike but not so much I'd return them. Worn in slightly damp/cool conditions (40s) and warmer/dry conditions (high 50s) and kept me at the right temperature. Runs small compared to clothing, but so does most good bike wear. Nice details include crossover waistband, reflective fabric on (covered) zippers. Definitely recommended.

    Avg. ride time: 0m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    Great fit, comfortable, warm

    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: Runs small
    • Size Bought: Medium

    Castelli is my favorite and these tights are no exception. They are a comfortable, cozy weight, feel good on, and fit super. I'm 5'5", 115 lbs, with a 25" waist and 35" hips. The medium fit perfectly. I also wear a medium in Castelli shorts. I'm typically a size small but routinely size up for Castelli shorts or tights. Castelli chamois are always comfortable for me, and while a bit larger than some others, it isn't noticeable when riding.

    nice warm and snug fit

    • Fit: True to size

    For me the size is true, I wear medium shorts/bibs, etc and is true to size. I am 5'6'' weight 135 pounds and have a shortish torso with longer legs. The chamois is not to big and fits well. Have not worn it yet, its not that cold in TX, yet

    Stayed (almost)_all dry in the rain

    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: Runs small
    • Size Bought: XL

    Wore these a couple of days ago in colder weather (high 30s- low 40's) when the weather threatened to rain. Well it actually snowed, and then it rained (light to moderate- not a downpour) ....Water droplets beaded on the tights and rolled off. When I took the tights off, my legs were dry. The only place that was wet was right above the saddle where the constant wheelspray from the rear tire was a bit too much for them. Was glad I was wearing them or surely would have froze descending the canyon. I have also ridden in them in dry weather (temp 40's to low 50s). They kept my legs warm without being stifling, nice for the cold descents, but wouldn't wear them if much warmer. Perfect if the weather is cool and threatening to rain. Would still rely on a truly waterproof pant if downright raining hard.
    They run small which is a bit of an ego bruiser--buy one size up.

    Unanswered Question

    hi, my hip is 90cm. What size of bib legging should i buy?


    • Familiarity: I've used it several times
    • Size Bought: small

    I purchased these for winter riding in PA. They keep me very warm on high 30 degree days. I usually wear a small in Castelli and thought I would need a Med after receiving them. They were tight around my ankles. I kept the small and they have worked out great.