A system for securing a flexible cover to a boat is described. The system includes a flexible cover defining a peripheral edge and a flexible member attached to the flexible cover adjacent to the peripheral edge. An edge clip is adjustably disposed on the flexible member. The edge clip includes a body defining an inlet and an outlet. The flexible member extends from the inlet to the outlet. A retaining element is disposed within the body to discourage movement of the flexible member with respect to the inlet and the outlet. The system also includes a hook, connectible between the edge clip and the boat for securing the edge clip to the boat, thereby securing the flexible cover to the boat via the flexible member.