Ultra-Thin Clear Skin Cover for Oura Ring Gen 4/4 Ceramic/Oura Gen 3, Invisible Transparent Anti-Scratch Protector Smart Rings Accessories Protective Film, 10-Pack (Size for 4/5/6/7/8)

I bought these Oura ring 4 clear covers for my 5: https://www.amazon.com/dp/B0GS56NN75?ref_=pe_125775000_1044873430_t_fed_asin_title. You have to narrow them a bit but after that they fit very well!