All Lualoha's are made of 100% colorfast Turkish cotton or a cotton and bamboo mix. The cotton and bamboo have hydrophilic abilities. Hydrophilic means "water loving" or "water attracting" (hydro is the Greek word for water and philic or philia means loving). A fun fact about cotton is that it is able to absorb up to 27 times its weight in liquid water, making it the perfect material for a towel.
As a general guideline, while you can use softener, it is not needed and can lead to the towels becoming less absorbent in the long run. Should that happen, simply soak your Lualoha in a water-vinegar mix before the next wash.