22" in diameter when open?? 12"long when closed</br>Wear it on your head with the elastic strap</br>Convenient?? light weight and portable</br>Multicolored 8 ribs for strong strength</br>4 Pack lot</br></br>Product Description</br></br>Online Best ServiceTM items includes A 90 Days Warranty. The warranty will be voided if purchased from a resellers or any company other than Online Best Service</br><br/>http://www.amazon.com/gp/product/B00J8ZNX022