I like the blue ABCCanopy umbrella :
(1) The underside is pitch black. Sun light appears to be completely blocked.
(2) It has 8 ribs, instead of 6. It is more resistant to inversion caused by winds.
(3) The construction appears to be good. Ribs are thicker than those of regular umbrella.
I have a problem with the umbrella failing to lock on closing. Amazon took care of it.
Make one of our best sellers your best defense against skin cancer! The ABCCCANOPY Wnidproof UV-Blocker UV Compact Umbrella is small and light but huge in protecting you and your loved ones from harmful UV rays with a 50+ UPF. Your compact umbrella is crucial to fight skin disease. Our quality UV Protection Compact Umbrella provides the highest UV protection and quality of any UV protection umbrella on the market. With a 50+ UPF (Ultra Protection Factor) rating, these umbrellas block 99% of the sun's harmful UV Rays (A, B, C). These sun umbrellas are made of a specially treated Solarteck fabric which reflects most of the UV rays while keeping you up to 15 degrees cooler in the strongest sunlight.