Southwire (By-the-Foot) 6/3 600-Volt CU Black Flexible Portable Power SOOW Cord 55809299 - The Home Depot
Electrical - Flexible Cords | Occupational Safety and Health Administration
Iron Forge Cable 25 Ft All Weather Extension Cord - Stays Flexible in Extreme Cold & Hot Temperatures from -58°F to +194°F - 12/3 SJEOW Heavy Duty - Amazon.com
Flexible Cord: Round Cables: UL and/or CSA Approved Cables by Salcavi Industries, electrical cables supplier (Italy).