Inflatable spa  cover Mspa in white PVC for inflatable spas.
For 4 seats Mspa. 
By using the cover of the inflatable save money on heat loss.
Isolating the water from the upper cover of the cover layer .
Thanks also shaped hot tub in the middle of a raised point , turning the hot tub drain rainwater.

Original brand of make is Mspa, will fit to other-brands inflatable hot tubs.