The answer is a lace-front. A lace-front base creates an undetectable hairline, which matters most when the style is swept back.
When hair is worn off the face, the front hairline is fully exposed, which is exactly the angle a lace-front piece is built to disappear at. Full-head bonding describes an attachment method, not a hairline solution, so it doesn't answer this question even though it's a real hair replacement term.
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