“Knockoffs” and “Quality” simply do not co-exist. Any knockoffs you find that claim to be fluoroelastomer aren’t actually fluoroelastomer. They’re all made in the same 2 or 3 factories in China, bought in bulk, and rebranded under a million different names. They’re, simply put, not worth it. As I said, I recommend getting a few made by Apple for discounted prices on eBay. You can get OEM bands for under $15 if you know where to look.