4 Hair Types with 6 Sub-Classifications
"A system that classifies hair texture based on curl pattern, density, width and porosity, to determine how best to care for, and style hair"
type 1--naturally straight
type 2--loose wavy
type 3--curly hair
type 4--coily hair
Types 3 and 4 have sub-classification of A-C based on diameter of hair curl and coil.
3a Curl diameter of a nickel; 3b curl diameter of a dime; 3c curl diameter of a straw
4a Coil diameter of a knitting needle; 4b coil diameter of an ink pen spring and can bend in sharp “z” shaped angles; 4c even smaller with a very tight zigzag pattern, and no coil at all.