Castelli Arm Sleeves UPF 50 + Light White

These Castelli arm sleeves are a must - have! Officially rated UPF 50+, they actually block 99.8% of harmful UV rays in lab tests. Made from a polyester base, they outperform nylon in UV protection and keep you dry, making them perfect for both cool and warm weather. With a clean construction, there are no rubbing seams. The double - sided silicone elastic ensures they stay put. They fold up tiny, so you can easily slip them into your pocket for your next big mountain adventure.

How to use: Simply slide the arm sleeves onto your arms. They're designed to fit snugly but comfortably. Note that they're made for general outdoor use, so avoid using them in harsh chemicals or extremely abrasive environments. When it comes to maintenance, machine - wash them in cold water with a mild detergent. Hang them to dry to keep their shape and elasticity. They're easy to carry around, so always have them handy for your outdoor activities.