After the release of the iPhone 4, Apple began to launch its own brand of bumper, which was to prevent the iPhone 4 from disappearing, that is, the "antenna door."
After the release of the iPhone 5s, Apple introduced a leather case. The iPhone 5c corresponds to a hole case designed to highlight the multiple colors of the iPhone 5c. Starting with the iPhone 6, Apple has been offering two official protective cases, a silicone case and a leather case.
The iPhone XR is a colorful one. If you continue to use a leather or silicone case, you can't highlight the color. This is one of the reasons why Apple will introduce a water jacket. In terms of price, the price of the iPhone XR water jacket is about $40.