The iPhone XR Clear Case was described by Apple:
“Thin, light, and easy to grip—this case lets you enjoy the look of iPhone XR while providing extra protection. It’s also crafted with a blend of optically clear polycarbonate and flexible TPU materials, so the case fits right over the buttons for easy use. On the surface, a scratch-resistant coating has been applied not only to the exterior, but also to the interior. Need to wirelessly charge? Just leave the case on your iPhone and set it on your Qi-certified charger.”
Interestingly, 9to5Mac pointed out that “this is the first clear case that Apple has produced since the iPhone debuted back in 2007.” Clear cases are notorious for turning yellow, but I have owned at least four Apple Clear cases since they were released, and all are still crystal clear, with only slight yellowing on the cases that are over 4 years old.
This case cost $39 when it was released.