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CastelliUpf 50+ Light Knee Sleeves

Sale $27.99 - $39.95

Item # CST00CK

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  • Black, S ($39.95)
  • Black, M ($39.95)
  • Black, L ($39.95)
  • Black, XL ($39.95)
  • White, S ($27.99)
  • White, M ($27.99)
  • White, L ($27.99)
  • White, XL ($27.99)
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Item # CST00CK

Upf 50+ Light Knee Sleeves

Protect your pins from sunburn and airborne allergens in the Castelli UPF 50 Plus Light Knee Skins. Fashioned from breathable, polyester-based Solare fabric, these lightweight knee skins provide protective coverage without risk of overheating when things get fast. Double-sided silicone elastic at the hems keeps everything comfortably in place for a distraction-free ride.

  • Castelli knee sleeves for keeping out the rays
  • Laboratory tests claim a 99.8% blockage of damaging UV rays
  • Solare fabric keeps the chill off without causing overheating
  • Polyester based for excellent moisture management
  • Double-side silicone elastic at top for excellent grip
  • Construction eliminates seams that can rub, irritate, or cause friction
  • Fold up extremely small for stowing in your pockets
Tech SpecsSize
Tech Specs
form fiting
UPF Rating
Recommended Use
Manufacturer Warranty
1 year


Arm & Knee Warmers





Rider Weight

99.2 - 132.3lb

(45 - 60kg)

99.2 - 132.3lb

(45 - 60kg)

132.3 - 154.3lb

(60 - 70kg)

154.3 - 176.4lb

(70 - 80kg)



Short/Jersey Size XS - S S - M S - M L - XL 2XL - 3XL
Short/Jersey Size:
Take your typical cycling short or bib sizing for comparison.

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Castelli Light Knee Skins

  • Familiarity: I've put it through the wringer
  • Fit: True to size

Great material, almost silk like. Does not retain heat. I do not notice them while riding.
I had a bad knee replacement. The sleeve around my knee combined with CBD oil is a great help. Even in the heat of the summer the knee skins feel good. Highly recommended.

Great for summer

  • Familiarity: I've used it several times

I ride in the desert heat and sun and need serious protection. I got these in black. They are very light and cool to wear and true to size. I still use sunblock on my knees just in case, and the combo seems to work great. They stay in place and I barely notice them. I cut the inside logo tags off as they irritated my skin. Otherwise, they are perfect. They hold up in the wash. I'm going to order a second pair in white.

Castelli Knee Sleeves Keeping Me Cool!

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: True to size

I just got these and the Pearl Izumi Sun Knees in the mail. These sleeves are VERY light weight and feel silky. I ordered the black in a small and they fit perfectly and did not slip at all on today's ride. The Pearl Izumi were heavier and the small was way too big.
I live in Arizona where HOT is the name of the season from May to October. I have very long legs and finding shorts long enough for me is always a challenge and leaves me with lots of my upper legs exposed. Lately I have been getting a heat/sun rash and so I thought I would give these a try.
I wore these this morning on a 30+ bike ride here in the AZ heat (temps topped out around 98 degrees). I found them to be comfortable and hardly even noticable and was surprised at how cool my legs felt. And I was so happy to NOT have any red bumpy rash at the end of the ride.
Washing them now and will hang to dry. I do think these are definitely a winner. However, If things change, I will post it.

JUNE UPDATE! Heat index is UP and these continue to keep me cool in 90+ degree temps. Truly a winner!!!

Is this a pair?

Hey Joel! These are sold in a pair.

No. Not everyone has two legs. You will need to order two. I only ordered one because I only need sun protection on my left leg. I'm ok with getting a terrible sum burn on the right leg. But not the left. That one is the money maker

So far, so good

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

I've worn these ~2 times. It's been hot both days, but they didn't feel any hotter than riding without them. I was most worried about size. I'm 5'11", ~150lbs. My thighs are 21.5" around, my calves ~15". I'm a Large and they fit great. I wear about a 32/32 in pants. They've ridden down about 1 inch over the course of a 50 mile ride, but I think they'll be fine if I wear them under my shorts instead; they've got grippers on both sides, so they can be worn over or under shorts.

Pretty Good, But . . .

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

The top band capably maintains the legging on the thigh without feeling too tight. The calf hem is very nice - no elastic, just a flat hem. I wore this product twice - once with the thigh band on top of my shorts and once underneath my shorts. Both ways worked well, but I did find having the band on top of the shorts was more comfortable. No issues with the leggings falling down.
I was disappointed after 5 hours riding that my thighs still showed some sun irritation. When held to the light, the material does permit rather good see-through. The fabric is very soft.
If you are someone like me who must be vigilant about sun exposure, these are good for cloudy days or short sunny day rides. I will keep looking for a denser knit material for longer sunny day rides. I have also read UPF-rated clothing only protects from UVB rays and not UVA rays - must wear sunscreen underneath UPF clothing to block both ray types.

It's true that UPF ratings are based solely on UVB protection, but that doesn't mean UPF-rated clothes provide no UVA protection. Clothes in general have been proven to have higher UVA/UVB protection ratios compared to the majority of broad-spectrum sunscreens.

Good Feel, Functional

  • Familiarity: I returned this product before using it
  • Fit: True to size
  • Size Bought: Large

I tried these on after trying out a pair of Pearl Izumi sun protectors. The Castelli fabric felt softer. The Castelli fabric also felt cool on my skin. The Castelli also has a more functional silicone strip for the thigh area to keep them from slipping. The Castelli is lighter as well. Only gave them 4 stars because I noticed a seam starting to tear right out of the box. I'll fix it before it gets worse. I am 5'10 and weight 160. My thigh is 20 inches and my calf is 12 inches. I originally purchased a medium and they were too tight around the thigh. Put in an order for a Large the same day. Hoping they fit perfect.

Are there different UPF or cooling qualities between the black and white colors?

I only bought the black and they seem to be very cool even here in AZ.