R14 Grade Standard Northernlights Hot Tub Cover 4" thick to 3" with an aluminum back spline for added support.
Includes 2 x child locks for added protection.
R21 covers are better for extremely cold climates with an R-value of 21 and a 5" thick cover sloping to 4" with a strong aluminum spine. Weight of cover increases by approx 40%
Includes 2 x child locks for added protection.