Synapse has advertised this as a 'new 4K restoration of the original uncut, uncensored Italian 35mm camera negative exclusively done by Synapse Films, with color correction supervised and approved by SUSPIRIA Director of Photography, Luciano Tovoli.' As Svet notes in his reviews, the Umbrella and Cult Films' Blu-rays utilize the 4K restoration conducted by TLEFilms FRPS in Germany.
The keep case is housed with a slipcover. Synapse Films' release of Suspiria comes on a BD-100 (feature size: 66.1 GB) for the central feature and a BD-25 for the bonus materials. They don't encompass the presentation's HDR10 and do not fully represent the film's color values when projected in 4K resolution. Note: Screenshots are pulled directly from the UHD disc and downsampled to 1080p.