Rothco Generation III Level 3 ECWCS Thermal Fleece Jacket - BlackRothco Generation III Level 3 ECWCS Fleece Jacket by Rothco. Rothco's Gen III Level 3 ECWCS Jacket, part of the Extreme Cold Weather Clothing System (ECWCS), aids in protection against harsh environments and can be worn as a standalone jacket or as a liner for a softshell jacket, parka, or other extreme weather jackets. Level 3 Of The Extreme Cold Weather Clothing System (ECWCS) Constructed Of Super Soft & Warm Polar Fleece Fabric Military Base Layer