Namely
Sodium Lauroyl Methyl Isethionate or SLMI is a mild anionic surfactant derived from coconut, which contains no sulphate. Unlike SCI (Sodium Cocoyl Isethionate), which allows for the creation of opaque products, SLMI has excellent water solubility and therefore allows for the creation of sulfate-free, transparent shampoo formulations. It is often used in conjunction with CAPB.
SLMI is produced by ethoxylation, which makes it an environmentally unfriendly ingredient. It is prohibited in the COSMOS specifications.