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Castelli Nanoflex Knee Warmers

$41.97 $59.95 30% off

Item # CST0479 Past Season Colors

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  • Black, M ($41.97)
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Item # CST0479


Block heaters for your well-oiled engine.

In rainy conditions, kneewarmers suffer from most of the same problems that legwarmers suffer. The fabric absorbs some water and their ability to keep your joints warm becomes compromised. The Castelli Nanoflex Kneewarmers solve the issues that challenge kneewarmers caused when riding in cold and wet conditions.

Nanoflex is a proprietary Castelli fabric. The mill begins with Castelli's super-warm and ultra-stretchy Thermoflex fabric, used in many of its winter garments and then coats the outside with ultra-tiny nanofilaments of silicone fiber. These fibers create a near waterproof barrier to moisture, and raindrops run off the fabric without soaking through. Despite its water-resistant finish, Nanoflex fabric remains highly breathable, keeping you comfortable in almost any conditions.

Silicone leg grippers keep the Nanoflex Kneewarmers in place even on the hardest rides. They run longer than some we've seen, from mid-thigh to the bottom of the calf. Reflective logos are printed at the knee and on the side of the calf to help you be seen on the road.

The Castelli Nanoflex Kneewarmers come in Black and in four sizes from Small through X-Large.

Tech Specs

Cuff Closure:
Recommended Use:
road biking
Manufacturer Warranty:
30 days

Size chart


Arm and Knee Warmers
Rider Weight 99.2 - 132.3lbs
(45 - 60kg)
132.3 - 154.3lbs
(60 - 70kg)
154.3 - 176.4lbs
(70 - 80kg)
Short Size XS - M S - M L - XL 2XL - 3XL
Short Size:
Take your typically cycling short or bib sizing for comparison.

Reviews & Community

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Here's what others have to say...

5 5

recommended item

these are excellent for early morning and evening rides. ...keep those knees protected and covered. ...with the correct size they will not fall down. Also you wear them under the shorts so the grippers grip, not over top of the shorts as they will not grip the material properly and slide down as you ride)

2 5

They kept falling down...

I wanted to love these but they are just not meant for a woman...I am 5-7, 125 pounds and they began creeping down after about 20 minutes into a ride. I had to keep getting off my bike to hike them up and pull my shorts back over them. I had Castelli shorts on so you would think the grippers on the shorts and warmers would work well together. I only rode 25 miles in them and they also bunched up behind my knees, causing chafing and irritation. I cannot imagine how torn up my legs would have been after a 50 mile ride even. The search continues...

5 5

Sizing feedback

Height = 184cm
Chest = 102cm
Waist = 83cm
Weight = 81kg

Size L is perfect fit and very comfortable

Responded on

I can say that I love thses knee warmers, they really are the best, that I have worn in quite sometime. Way to go Castelli