All of Salisbury’s ASTM Dielectric Footwear conforms with ASTM F1117 and all are 100% tested to the electrical hazard requirements of ASTM F1116 at 20,000 volts. This Non-Buckle Overshoe comes in Whole Sizes 7 - 17.Features & Benefits:● ASTM Dielectric Footwear provides extra safety when climbing ladders and poles where the deep heel cavity can lock onto the rungs. These overshoes are 100% waterproof and made from premium grade ozone resistant rubber. The construction is hand-layered in full-cut patterns to fit over work boots. The fabric lining makes them easy to get on and off. The sole has a durable construction with a non-skid bar tread outsole.