Subcategories within each type are based on the thickness of hair strands: Type 1 hair grows from round, symmetrical hair follicles. It is straight, with no waves or curls from root to tip ...

“Men should be tailoring their shampoo and upgrading to one that fits their hair type from the jump so it ... This comes as close to a 2-in-1 shampoo-conditioner without actually being one ...