GLI Pool Products HyperLite 20-1636RE-HYP-BLU-K-AC 16' x 36' Blue Rectangle Safety Cover. If you open your pool in the late spring, have large amounts of leaves and debris in the yard and require the strongest and lightest solid safety cover available - this is the cover for you! If you open your pool in the late spring, have large amounts of leaves and debris in the yard and require the strongest and lightest solid safety cover available - this is the cover for you.