Castelli can officially only rate these warmers at UPF 50+, but in their laboratory tests they actually blocked 99.8% of damaging UV rays. Castelli have used a polyester base that is not only more effective than nylon at blocking UV rays but is also much better at keeping you dry.
- Polyester based for excellent moisture management
- Solare fabric keeps the chill off without causing overheating
- UPF 50+ protection
- Double-side silicone elastic at top for excellent grip