 hanesbrands socks manufacturing facility leed certified hanesbrands sock manufacturing facility in san juan opico el salvador opened in march 2009 this 450000squarefoot facility has 1000 employees who knit bleach dye board and pack millions of pairs of socks annually the facility was designed with a variety of features to save energy including skylights to maximize the use of natural light daylight harvesting which is the use of digital photo sensors to detect daylight levels and automatically adjust the interior electric lighting to create a balance led technology for task lighting for work that requires a higher light level these lighting features alone will avoid nearly 4 million kilowatthours per year saving approximately 380000 per year the facility is one of the first leed certified apparel manufacturing facilities in the world enerim ltd performed the energy modeling for the project  