Hi-key white muslin is made of fabric for the even flow. There is hi-key white on one side and dull white on other side. This is a very high quality muslin backdrop.
Hi-key white backdrops are thickest fabric and it is suitable for portrait photography. Because of the opaque coating it is made non reflective.
The two sides of the backdrops can be used in different settings. It is best suits for fashion photography.