Tingley 31251 Pvc Knee Boots By Tingley Have An Injected Molded Construction For 100% Waterproof Protection And Steel Toe That Meets Astm F2413 M/I/75/C/75. These Boots Are Made From 30% Recycled Material And Flexible Upper Material That Stays Supple In Cold Temperatures To Make Walking Easier. The Self-Cleaning Cleated Outsole Spits Out Debris As You Walk. The 31251 Pvc Knee Boots Also Feature A Removable Cushion Insole For Increased Comfort. Ideal For General Purpose In Agriculture, Industry, And Construction.,12