True comfort and safety are exhibited by the Men's 6" Waterproof Nano Composite Safety Toe CellStretch Work Boot. This handcrafted, full-grain leather boot has a Nano Composite Safety Toe, which is one of the lightest and strongest safety toe alternatives available. It is manufactured by weaving together carbon nanotubes. Twisted X has blended a nylon/glass fiber shaft, Blend85 recycled foam footbed, and our patent-pending CellStretch comfort technology for stability and comfort.