To seal the sides Durable GapMaster™ hooks wrap around swing-open trailer doors, sealing hinge gaps that amount to over two and a half square feet of open air if left unsealed. To seal the top, an exclusive weighted head curtain applies over 100 pounds of pressure across the full width of the trailer top. This gravity-based system keeps the curtain in constant contact with the trailer during loading and unloading, ensuring a tight, consistent seal. The Eclipse side curtains and weighted header work together to seal gaps that ordinary shelters don’t address. Additionally, innovative fabric corner pockets connect sides to top, providing a dark, complete seal when trailers back into place. To seal the bottom, lip corner seals, filler pads and other components block gaps on the inside of the dock.