Simois is a lace hair system with a base combined with lace and poly. Simois base is crafted with lace at the center, 1 inch of thin PU around the perimeter of the base with half an inch of lace in the front of the base. The central lace base provides a breathable and soft feel. The thin PU around the perimeter makes it easy to attach and remove and the front lace provides you with a natural hairline. Simois truly has it all.