PoolTux CSPTBMP20403 20' x 40' Blue King99 Mesh Rectangle Safety Cover with Flush Right Step. King99 Mesh Swimming Pool Safety Covers add a touch of class to your swimming pool over the winter with a PoolTux King99 Mesh swimming pool safety cover. These versatile mesh swimming pool safety covers offer a unique combination of performance, ease of maintenance and superior protection. The two-ply bias weave mesh material keeps debris out, yet allows rainwater and melted snow to drain through. King99 Mesh pool safety covers are lightweight and easy to install and remove. We are so confident in our King99 Mesh swimming pool safety covers, that we stand behind them with a warranty the other only give to high end covers.