Healthy thick wavy hair

Hair has never been dyed. I rarely use heat tools, maybe 1-5 times a year. Hair is extremely healthy, not dry and no split ends. I treat my hair very well. Use oil treatments twice a week and use leave in conditioner after every wash. I sleep in silk bonnets and only use silk hair ties. Hair holds styles very well. Holds curls all day, sometimes until the next day. Is naturally wavy and thick.