Skin simulation cap. Awesome for breakage, receding edges, scalp injuries and medical conditions. It's like the prosthetic cap but not as expensive or complicated
Best of all it allows for hidden deep conditioning which basically means you can conditions your hair under your weave, or wig. It's air tight, water and sweat proof and won't budge or bunch. Plus it looks and feels like your skin.
You can get it as a cap, a band, or closure piece and you can use it under your wig or weave (sew in or glue) with no damage to your hair.
You can part your hair to show your scalp even with the full cap.
I wear mine over my hair at night because I tend to toss and turn and I hate having to wear a scarf, nylon rag or net. Also you don't have to worry about buying silk pillow cases or sheets. Plus, it washes and dries instantly like skin, is simple and really undetectable.
Before bed I saturate my hear with a leave in and place my cap on. When I wake up it's still on and my hair is soft and gradient.