5.11 Men's Speed 4.0 8in Side Zip Boots - The new Speed 4.0 comes equipped with polishable leather uppers reinforced with nylon for durability. These are boots that are built to last. Polishable leather and nylon upper High abrasion breathable mesh tongue YKK side zipper Ortholite insole 5.11 Heat Deflect underfoot layer 5.11's Force Foam heel cushioning Full rubber outsole with improved slip-resistance Updated tread pattern for traction in multiple terrain Force Foam dampening PU foam for optimal cushioning ASTM slip and oil resistant outsole Style: 12454