4A hair is made of dense, springy S-patterned coils that are fine to wiry in texture, tighter and more fragile than 3C but with a defined pattern unlike 4B. Products for 4A hair often include deep conditioners and heavy creams that promote moisture retention and elasticity, differing from the lighter lotions used for 3C hair. 4A-specific products are geared towards enhancing the natural coil pattern with creams and gels that provide both definition and moisture, whereas 4B and 4C might focus more on manageability and combating shrinkage.