For my S25 I bought Kindsuit Case (grey color) - not heavy, not big but no natural leather (real photo in attach).
Maybe later I will buy Pitaka case:
Looking for the best Samsung Galaxy S25 case? Explore PITAKA's aramid fiber cases for protection, style, MagSafe compatibility and easy wireless charging.
www.ipitaka.com
On my old S21 Ultra I used four type of cases:
1. Silicone Cover (not too heavy but over time it became not very pleasant for hands)
2. Leather Cover (little more heavy still good)
3. Protective Standing Cover (heavy but the phone has survived many falls)
4. K-DOO case (similar with Pitaka) (very slim, lightweight and the phone has survived many falls too)