TOP COVER: 
The top cover is an innovative antibacterial top cover, it is antibacterial and breathable to help kep feet dry and odor -free during extended wear day after day.

BASE:
The base is TAOSPRENE,TAOSPRENE is bio-degradable polyurethane which is derived from plants.It is high quality PU foam that absorbs weight-bearing pressures for extra cushioning and comfort.