| Fabric | 60% Micro Supreme yarns, 20% silver embedded yarns, 12% stretch nylon, 5% lycra, 3% MTF polyester Bio-Silver | Silver Ionized yarns that are weaved together to create an anti-microbial barrier. This helps reduce bad odors and prevent bacteria from metabolizing.r Finish | Engineered for high performance boots, Designed to enhance boot fit and performance, Densely knitted micro fiber yarns eliminate bulk while maintaining warmth and comfort Features | Bio-Silver� Technology, Moisture managing yarns, Moisture transfer chimney, Smooth looped toe closure, Arch stabilization band, Articulated hinge at ankle break, Warmth Factor = 7 |