Thermal cap has a lot of hair benefits of heat without being too damaging like a flat iron or curling wand.  This heat cap has really good benefits which are:
Helps hair dry faster- A thermal cap is a great way to dry your hair, it's like a blow dryer you wear on your head.
Helps one to set your style-heat caps can help you set your style, it's especially useful if you're trying to lock in moisture and set your style at the same time.
Cheaper and steamer-A heat cap is more affordable than a steamer. 
Great for special treatments- A thermal cap is perfect for hot oil treatments to seal strands, as well as doing deep conditioning mask. The heat will help open up the cuticle to allow a deeper penetration into strands.
Helps with scalp circulation-Heat naturally encourages circulation in the body.When your scalp has proper circulation, it will be healthier in terms of hair growth and distribution of natural oil.