Exclusive 4-Tier Cushioning System Layer 1 - MyPillow Patented Fill We took the MyPillow patented foam you know and love and created a solid layer to provide incredible comfort. Layer 2 - Comfort Memory Foam This layer of comfort memory foam provides that micro comfort and support to wear all day Layer 3 - Patented Impact Gel The impact gel is revolutionary in absorbing impact and relieving pressure Layer 4 - Indoor/Outdoor Sole For all day use Finished with high quality leather suede made from US cowhides MySlipper linings are soft and cozy Indoor/Outdoor - The durable rubber outsole is designed to be worn both inside or outside