4 layer bamboo terry/bamboo cotton snake inserts, 8 layers when folded.

2 layers of bamboo terry inside 2 layers of bamboo cotton

Bamboo cotton is very soft and fluffy, as shown in 2nd picture of trifold.

Bamboo Cotton (outside) 75% bamboo, 25% cotton

Bamboo Terry (inside) 80% bamboo, 20% polyester