This article explains why cases turn yellow. It's the material Thermoplastic polyurethane (TPU). So look at the material of a case and if it says "TPU" or "TPE" (TPE is an older cheaper version of TPU AFAIK) then it will yellow.. Polycarbonate (PC) is a hard clear plastic, and it does not yellow. Apple cases are 100% PC, but they are also unpleasant. I bought one and returned it because it started to crack, was expensive, and was unpleasant to hold. For example, Spigen Liquid Crystal just like all soft clear cases is TPU and will yellow in about 5-6 months despite any marketing claims. But they are cheap on Amazon and I used to just replace it every 6 months for about $10. I currently use Spigen Ultra Hybrid MagFit . The back is Polycarbonate and won't yellow. The edges are soft TPU and the edges will yellow over time though I had one for a year and never noticed it. It's less noticeable on the edges and it depends on how much heat it is exposed to. So no matter what case you shop for, just understand the materials. PC won't yellow but TPU/TPE will. Either live with some risk of yellowing and don't pay too much so you can replace it or pull a replacement guarantee with the manufacturer (often requires you to buy directly from them for a higher price, not amazon) Or shop for a PC case like this one (just a randomly chosen one.). Search Amazon for "iphone 13 pro max polycarbonate case". EDIT. Never Mind, it looks like this one is a TPU/PC hybrid as well. Honestly most PC/TPU hybrids hold up really well and aren't expensive. I'd just go with one like that. I've been pretty happy with the Spigen. Answer from Whiplash104 on reddit.com