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Castelli Upf 50+ Light Knee Sleeves

Item # CST00CK

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  • Select options
  • Black, S ($39.95)
  • Black, M ($39.95)
  • Black, L ($39.95)
  • White, S ($39.95)
  • White, M ($39.95)
  • White, L ($39.95)
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Item # CST00CK


Knee sheath.

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.

Tech Specs

form fit
UPF Rating:
Recommended Use:
Manufacturer Warranty:
1 year

Size Chart


Arm & Knee Warmers
Rider Weight

99.2 - 132.3lb

(45 - 60kg)

132.3 - 154.3lb

(60 - 70kg)

154.3 - 176.4lb

(70 - 80kg)



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

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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.

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.

Unanswered Question

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