Ignore the weather forecast.
When the forecast is slightly chilly with a chance of drizzle, be proactive about your knee protection with a pair of Castelli's Nano Flex+ Knee Warmers. They'll resist the elements so your tendons stay dry and happy to turn over long, cloud-covered miles.
Nano Flex starts its life as the warm, stretchy Thermoflex fabric used in many of Castelli's winter pieces. It then gains an outer coating of tiny nanofilaments of silicone fiber that create a water-repellent barrier so raindrops and road spray dead up and run off without soaking through. Despite its water-resistant finish, Nano Flex fabric remains highly breathable, keeping you comfortable even when rain falls in the low 60s.
Across the back, Castelli uses a panel of its lighter Nano Light fabric to increase stretchiness behind your knee for full freedom of motion without reducing protection from the elements. In our experience, the previous generation of Nano Flex warmers tend to bunch behind the knee. This is a common ailment in knee warmers, so it's a small price to play for dry joints, but the addition of Nano Light helps to address that common nuisance.
Silicone grippers on both faces of the thigh hem and the inner face of the calf hem keep the warmers in place.
- Water-resistant cycling warmth for your knees
- Soft, brushed lining protects against the chill
- Silicone grip holds hems in place
View more 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
THEY DID NOT LIKE MY KNEES
- Familiarity: I've used it once or twice and have initial impressions
- Fit: True to size
These did keep my knees warm when they would stay in place but I had to stop my ride several times to pull them back into position. After eight miles I gave up and took them off. Next ride I will bring Duck Tape along! They fit snug on my legs but maybe they
should fit like my SKINS (very tight). I ordered a large because my legs are
not skinny, maybe I will trade them for
a medium and see how they like my knees then. Update 4.12 Exchanged for a medium and they slipped less.
- Fit: True to size
I like knee warmers, don't own leg warmers, and these are the best I have of four other brands. Cool stuff, keeps the knees toasty and long enough to keep the thighs warm under your shorts.