Durable mini cell foam cushions your boat and protects your vehicle
The slot in the foam blocks can pop onto the canoe gunwales (two per side)
Then the flat non-skid surface is placed directly on the vehicle roof
You can also slip the slots in the blocks over factory rack load bars and set the gunwales on the non-skid surface
Then attach the 14' J-hook Straps to the bow and stern of the boat and affix them to the front and rear of the vehicle