Blue Wave 18-ft x 36-ft Rectangular Rugged Mesh In Ground Pool Winter Cover Pool size: 18 feet x 36 feet Cover size: 23 feet x 41 feet Number of 8 feet water tubes needed: 16 Rugged mesh allows only rain water and very fine silt to pass through Protects against sun, snow, ice and wind Pool size: 18 feet x 36 feet Cover size: 23 feet x 41 feet Number of 8-Feet water tubes needed: 16 Rugged mesh allows only rain water and very fine silt to pass through Protects against sun, snow, ice and wind