Original: If used , the spraydeck or similar waterproof garment attaches securely to the edges of the cockpit , preventing the entry of water from waves or spray , and making it possible , in some styles of boat , to roll the kayak upright again without it filling with water or ejecting the passenger .
Simplified: The spray skirt or similar waterproof garment attaches securely to the edges of the cockpit , that no water from waves or spray may enter the boat .