I think you can wear this under a helmet for sun and rain protection. Made of mesh material, it's stretchy, one size fits all, lightweight, and breathable, making it comfortable to wear. It's new and unused, but please consider purchasing if you understand that it's a foreign product. (Actual photos 3, 4, 5, 6) *I also have other cycle caps for sale. I will only offer a discount for multiple purchases, so please comment. ↓ ↓ ↓ ↓ #oguogu cycle cap list *Please note that it will be folded small and shipped in simple packaging. BEAVIS AND BUTT-HEAD Beavis and Butt-Head Beavis and Bad-Head