The Darrell grommet extra wide curtain panel is ideal for covering large windows and patio doors. These blackout curtain panels will block most of the outside light. The darker the color, the better the light reducing capabilities. These energy efficient curtain panels help keep your home cooler in the summer and warmer in the winter. Eclipse Thermaweave curtains feature blackout fibers woven into soft, drapable fabric, creating a stylish triple weave technology energy efficient curtain. Metal grommets make it easy to open and close your curtain panel.