They work well on flat bars. However, they create a lot of tension in the folding rods. It's weird on my hands, but more importantly, it's too tight for the fabric, which only started tearing at the bottom after I removed my gloves. Broke after taking gloves off a second time. Still usable as a sunscreen at least because it's not completely disassembled and the tear is on the inside of the wrist so less sun exposure.
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