The Spenco(R) TPR Gel (Thermoplastic Rubber) provides shock absorption and 44% energy return. Not only does it provide cushioning, but it also provides forward propulsion to reduce the burden on your lower legs. Full-Contact Comfort(TM) Fit makes the environment more comfortable. Top cloth is treated with Silpure(R) antimicrobial treatment. Trim at the tip for fine adjustment. Country of manufacture: China; Material: Brushed polyester top cloth TPR (thermoplastic rubber); Product Size: 8.9 - 9.3 inches (22.5 - 23.5 cm); Specifications: Work boots and outdoor shoes compatible; Heavy (thick); Replaceable insole (arch, support type).