Reflx Lab 400 is Kodak Vision 3 5207 250D that is modified and suitable for C-41 processing. Cinestill 400D has been a huge hit and subsequently in scarce supply.

Made from fresh 5207 motion picture film
Rem-Jet layer removed
Daylight balanced film, ideally for outdoor shooting during the day
Film Format: 35mm color negative
ISO: 400 (DX coded)
Process: C-41
Number of Exposures: 36