The pillow core is filled with custom 3D cotton from the manufacturer. The characteristics of 3D cotton include: good softness, fine and soft fiber texture, low tendency to deform, good elasticity, white color, and strong air permeability. Common 3D cotton, on the other hand, is prone to clumping, deformation, poor elasticity, and poor color. Customer satisfaction is our constant commitment to product and quality, and we look forward to your visit.