What is the main takeaway about curly hair products?

Read the full guide above for detailed explanations and product recommendations.

Where can I learn more about curly hair products?

See our buyer guide and head-to-head comparison linked at the end of this article.

The Definitive 2A to 4C Curl Type and Hair Porosity Guide

By Jessica Chen Hair Care Specialist Published August 25, 2026

The Definitive 2A to 4C Curl Type and Hair Porosity Guide - featured image

An educational guide from the Beauty AMZ research team. No hard sell, just what you need to know.

The curl type chart: 2A to 4C explained

Type 2 is wavy: 2A has loose S-waves, 2B has more defined waves with some frizz, 2C has thick waves bordering on curls. Type 3 is curly: 3A has large loose curls, 3B has tighter springy curls, 3C has tight corkscrew curls. Type 4 is coily: 4A has defined S-coils, 4B has sharp Z-pattern coils, 4C has the tightest coils with significant shrinkage. Most people have a mix of two or three types on one head, which is completely normal. Identify your dominant pattern and choose products for that, adjusting technique for the other sections.

Porosity: the factor most people ignore

Porosity matters more than curl type for product choice. Low porosity hair repels water, takes long to get fully wet, and products tend to sit on top rather than absorb. It does best with lightweight formulas, heat during deep conditioning to open the cuticle, and clarifying regularly to prevent buildup. Medium porosity hair absorbs and retains moisture well and handles most products. High porosity hair, often from bleach or heat damage, soaks up water instantly but dries just as fast. It needs protein treatments to fill gaps in the cuticle plus heavy sealants to lock moisture in.

Building your routine: cleanse, condition, style

A solid curly routine has three steps. Cleanse with a sulfate-free shampoo, or co-wash with conditioner if your hair is very dry. Condition generously, detangle while the conditioner is in, and rinse with cool water. Style on soaking wet hair: apply leave-in first, then your styler of choice, using praying hands or raking to distribute evenly, then scrunch to encourage curl formation. Diffuse on low heat or air dry, then scrunch out any crunch once fully dry.

Ingredients to look for and avoid

Look for humectants like glycerin and aloe vera that draw moisture into hair, emollients like shea butter and oils that seal it in, and proteins like hydrolyzed wheat or silk that strengthen. Avoid sulfates that strip natural oils, non-water-soluble silicones that build up without clarifying, and drying alcohols like isopropyl alcohol. Note that not all alcohols are bad: fatty alcohols like cetyl and cetearyl alcohol are moisturizing and appear in most good conditioners.