Nunatak Apex Floor InsertsThe Nunatak Apex has 3 floor inserts to choose from depending on your base camp needs. The heavy duty canvas ground cloth weighs in at 10. 7 lbs and is ideal for longer stays and when weight is not a consideration. The Midweight Nylon ground cloth comes in at 4. 6 lbs and is the preferred choice for keeping the weight low while Fully covering the ground inside the shelter. The lightweight half ground cloth is made of the same nylon as the midweight