Pool insulation

[m1970c]

I have a 10' Intex easy set pool and have juist got myself a 3kw heater the pool is in a Gizibo with all sides covered is there anything i can put UNDER the pool to stop the heat going down ( THE POOL IS ON A WOODEN BASE)

I would attach a pic bit it is too big ! :(

Any advise would be welcome

Thanx in advance

Martin :)