"Realme 12 5G ClearFlex Soft TPU Bumper Case"

"Realme 12 5G ClearFlex Soft TPU Bumper Case" sounds great! It's concise, informative, and effectively conveys the key attributes of the product—clarity, flexibility, and protection. If you're looking to make it even more appealing, you could slightly tweak it for a more dynamic feel:

"Realme 12 5G ClearFlex Bumper Case - Soft TPU Protective Cover"

This version emphasizes both protection and the material quality (Soft TPU), giving it a sleek, professional sound. Would you like more variations or a tagline to go with it?