How to tell if you have 1A, 1B, or 1C hair

Figuring out your straight hair type isn't always straightforward—honestly, it can be a bit of a headache. But getting it right matters more than you'd think, especially when you're standing in the drugstore aisle trying to pick the right shampoo. The whole Type 1 thing breaks down into 1A, 1B, and 1C, and the differences come down to texture, thickness, and whether there's any hidden wave lurking in there. Here's how to actually tell what you're working with.

What is the difference between 1A, 1B, and 1C hair?

So what's really going on here? It's all about strand thickness, how much volume you've got, and if there's even a hint of a bend. 1A hair? Super fine, dead straight, zero body—like it just gave up on life. 1B has a bit more going on—more texture, some volume, and maybe a slight curve at the ends. Then 1C is the thick, coarse one with an actual "S" wave that starts somewhere around mid-length or even the root. It's not curly, but it's definitely not flat.

How can I identify my straight hair type at home?

You don't need a salon to figure this out. Try a couple of DIY tests. Wash your hair, skip all the products, and let it air dry completely. No cheating. Then grab a single strand and roll it between your fingers. Feels like silk and you can barely see it? That's 1A. Feels more like cotton or has a little texture? Probably 1B. If it's thick and coarse, you're looking at 1C. For the volume check, pull your hair into a tight ponytail. Less than 2 inches around means fine hair (1A). Two to three inches is medium (1B). Over three? That's thick (1C). Pretty simple, right?

Does 1C hair ever curl?

Nope, not really. 1C is still straight hair, even if it sometimes tricks you. It can have this subtle "S" wave, especially when it air-dries or when the humidity kicks in. But that's not a real curl—it's more like a gentle bend or kink that gives it some body. Some people with 1C hair can scrunch it with product and get a wavy look, but without heat or styling, it'll always go back to straight or just slightly wavy. Don't let it fool you.

What are the best products for each straight hair type?

Quick Checklist: Identify Your Hair Type

• 1A Check: Is your hair perfectly straight from root to tip? Does it get oily fast? Can you never get a curl to hold? Volume? What volume? If that sounds like you, you're probably 1A.
• 1B Check: Got some body and volume? A slight bend at the ends? Not super fine, not super coarse? That's classic 1B territory.
• 1C Check: See a visible "S" wave, especially when damp? Is your hair thick and coarse? Does it frizz up at the drop of a hat? Holds styles well? You're likely 1C.

Expert Insight: "Most people misdiagnose their hair type. The key is to look at your hair's natural state after air-drying without any products. 1C hair is often mistaken for wavy (2A) hair because of its slight bend, but true 1C hair lacks a defined curl loop." — Dr. Sarah Jones, Trichologist