Blue Wave Gold 15-Year 25-ft x 45-ft Rectangular In Ground Pool Winter Cover Pool size: 20 feet x 40 feet Cover size: 25 feet x 45 feet Number of 8 feet water tubes needed: 16 Protects against sun, snow, ice and wind 5-ft overlap to ensure proper fit. Integral cover loops to secure water tubes Pool size: 20 feet x 40 feet Cover size: 25 feet x 45 feet Number of 8-Feet water tubes needed: 16 Integral cover loops to secure water tubes 5 foot overlap to ensure there is no stretching or ripping