Is there a silicon iPhone 5s case?
Does Apple (or someone else) make a silicon case for the 5s? Or, do these only exist for iPhone 6 and 7?
iPhone 5s, Case
Apple does not appear to make one anymore, but there are 3rd parties that make them:
https://www.amazon.com/Eco-Fused-Silicone-Rubber-Microfiber-Cleaning/dp/B009T0Q5 7Y
For more results try looking for iPhone SE cases. the SE has the same dimensions as the 5s, so any case for the SE will fit the 5s too.