The Silk Base is constructed with as layer of lace, and pure silk fabric on the top of the cap. By hand sewing the knots of the hairs under the silk base, the knots are concealed between the layers and the hair is then injected through the silk material, which can provide the illusion that the hair is coming from your own scalp. Making the knots 100% invisible.

So far Silk Base is considered to provide the most realistic scalp the market has to offer. You don't need to bleach the knots, you don't need to worry about any other techniques to make the knots invisible and undetectable.

PROs
Realistic Looking: The Silk Base Wigs can bring you the appearance of having a scalp that looks like your own, which is the most realistic topper base on the market today. With Silk Base, you don't need to hide or camouflage the knots when you part your topper!
Styling Versatility: The Silk Base offers versatile styling options as you can part your silk topper any direction.

CONs
Difficulty to Lay Flat: Due to the duo layers or even the triple layers of the Silk Base, the Silk Base are not very easy to lay flat on the head of wearers, sometimes may get bulky on the crown. 
Breathability: Due to its unique layered construction, the Silk Base can lack breathablity, compared with lace and mono base. You may find it to be a tad hotter during the summer than the other two bases.