Rock Fall PowerMax High Leg Waterproof Electrical Hazard Safety Boot A revolutionary Safety boot. PowerMax was developed in conjunction with a major power company and has been tested to International Electrical Hazard Standards. It’s also 100% Non-Metallic and fully waterproof. Specification: EN ISO 20345:2011 SB P CI E FO PowerMax Spec & Test SheetRock Fall Rock Fall PowerMax High Leg Waterproof Electrical Hazard Safety Boot | Work & Wear Direct