Are these super dense and solid 1" construction? Or do the bottoms have a honeycomb or other type of construction?

Our 1" Horse Stall mats don't have a honeycomb bottom and are a solid construction throughout. They aren't super dense as they are semi-porous and will allow water and other liquids to pass through them. They are very durable but are not vulcanized, which would give you the densest and solid tile construction.