I would like to install the Coin Nitro in my basement which is on a concrete slab. What type of insulation would I need to keep cold air from coming through? Currently it is carpeted and I do not feel cold air.

You wouldn't need to add any insulation to our Coin Nitro Rolls over your concrete slab. These rolls are non-porous meaning cold air will not travel through the roll. If you did want to add insulation to these rolls, you could place a foam or cork underlay under these rolls for added comfort and warmth.