Dri-Wright inner layer. Hi-Bulk Acrylic outer layer. Hidden terry loop cushion for added comfort. Stabilizer Zone in arch for greater control. Always smooth, undyed, hydrophobic surface against foot. Inner Layer: 70% Dri-Wright, 30% Nylon Outer Layer: 72% Hi-Bulk Acrylic, 24% Nylon, 4% Lycra |