This refers to hair cuticles that are closely laid on each other, they are so tightly packed that there are no spaces between the cuticles so it makes it hard for water and oil based products to penetrate the hair shaft. This makes it hard for the hair shaft to retain moisture.
How to determine how porous your hair is.
Just follow any of these 2 steps:
The float Test
Shampoo and rinse your hair well to remove any product buildup. Clean hair will give you the most accurate results.
Dry your hair as usual.
Take a strand of your hair and drop it into a clear glass of water.
Watch the hair strand to see where it floats for 2-4 minutes.
The Slip'n'Slide Test:
Remove a strand of hair and slide your fingers up the shaft (toward the scalp). If you feel little bumps along the way, this means that your cuticle is lifted and that you have high porosity. If your fingers slip smoothly, then you have low porosity hair.
Moisturize Low Porosity Hair Yes low porosity hair can be moisturized too.
Use a steam cap, a warm towel or shower cap for 8-10 minutes to help products penetrate and bind.
Avoid over styling.
Wash your hair every 2 weeks or every week to prevent product buildup up and blocking that moisture that needs to get in. We recommend giving close attention to the products you use on your hair so you will not have to worry much about buildup.
Ensure you pre-poo before washing your hair.
Cover your hair.
Moisturize your hair mid-week.
Get a good leave in conditioner.