A thermal insulation cover for a pool, and an above-ground pool are provided. The thermal insulation cover comprises: a side wall portion, which is annular and is adapted to surround a wall of a pool; and a top cover portion comprising an outer circumference connected to a top circumference of the side wall portion. Each of the side wall portion and the top cover portion comprises an outer layer, an inner layer, and a filling layer disposed between the outer layer and the inner layer. The filling layer may be polyester batting.

A cover securing system for a pool cover on an above-ground pool comprises a peripheral fasteners and a weigh down apparatus; wherein the peripheral fasteners is configured to engage a periphery of the pool cover with a top rail of the above-ground pool.