Silk Top Lace Wigs are the most realistic lace wig caps on the market today. What is a Silk Top Wig? Silk Top hidden knots wigs are constructed with a layer of lace, and silk fabric on the top front of the cap. When the hair is knotted, the knots are below the silk concealed between the layers, the hair is then injected through the silk material making the knots 100% invisible giving the illusion that the hair is actually growing out of your scalp. There is no other ventilation technique that creates a more flawless appearance than hidden knots on a silk top, you don't need to bleach the knots, you don't need to worry about any other techniques to make the knots invisible or less visible.