Our Super Fine Swiss Lace base is the most undetectable lace material on the market. Super Fine Swiss lace can hold medium light density at the most for short hair. If you have long hair we recommend light density. If your hair is heavier than medium light, you can consider a Full French Lace hair system instead. Since Super Fine Swiss Lace is very delicate, careful use and maintenance are required. The lifespan is also shorter than a Full French Lace system.