Light weight polyethelene. Provides extra protection when working from ground, pulling conductors or when working near energized equipment. Supports up to 300 lbs. Heavy non-skid surface on top prevent slips. Extra large legs with non-skid base to prevent tipping or skidding. Sturdy handles built in on all 4 sides - easy to carry and transport. Filled with unicellular polyurethane foam to provide a strong lightweight surface.