The Castelli Light Sleeves can officially only rate these warmers at UPF 50+, but in their tests they actually blocked 99.8 percent of damaging
UV rays. They use a polyester base that is not only more effective
than nylon at blocking UV rays but is also much better at keeping
you dry, which means these arm sleeves are better in both cooler
and warmer conditions. They've kept the construction very clean
to eliminate seams that can rub, and use a double-sided
silicone elastic to make sure they stay in place. They fold up
extremely small, so they're great to stick in your pockets for your
next big mountain day.
- Solare fabric keeps the chill off without causing overheating.
- UPF 50+ protection.
- Polyester based for excellent moisture management.
- Double-side silicone elastic at top for excellent grip.
- 8¬∞-18¬∞C / 45¬∞-70¬∞F.