Castelli UPF 50+ Light Arm 2 Sleeves

Castelli officially rates these warmers at a UPF of 50+, but our laboratory tests have shown that they block an impressive 99.8% of harmful UV rays. We utilized a polyester base, which is more effective than nylon at blocking UV rays and significantly better at keeping you dry. This means these arm sleeves perform well in both cooler and warmer conditions.

We have designed the construction to be very streamlined, eliminating seams that could cause irritation. Additionally, we incorporated double-sided silicone elastic to ensure the sleeves stay securely in place. They fold up into a very compact size, making them easy to carry in your pocket for your next mountain adventure