Choosing Floor Insulation

[conantum121]

I am installing a 24ft. Pacific Yurt, Winter

Insulation

package for walls and roof, 4*6 beams sitting on 4*4 posts, 1&1/8 ply floor. Im in Northern California: hot summer, cold and wet winter. Im looking for advice on the best

insulation

for the floor. I've heard a lot about the rigid foam. Im interested in non-toxcicity and insulation value. Is there an effective eco-friendly option that won't get moldy and attract critters? Vapor barrier recommended? Thank you.