Many listings show rust-resistant or metal (aluminum) grommets/eyelets around the edges, reinforced corner plates, and reinforced hems. Some tarps also have integrated poly rope along the perimeter for added strength; a few list grommets spaced about every 2 feet.
Seams are often heat-sealed and hems are reinforced for durability. Many tarps include an integrated poly rope or reinforced hem around all sides to strengthen the edges and help resist tearing.
They’re secured via grommets or eyelets around the edges using cordage such as rope or bungee cords; some listings note metal-reinforced grommets along each edge or grommets spaced every 2 feet.
Descriptions vary: some list numeric hydrostatic/waterproof ratings (examples given include 600 mm and 450 mm), while clear PVC vinyl options are described as fully waterproof for blocking rain and snow.