A medium beehive super that has only advantages!
Filled with polyurethane foam insulation.
It is very lightweight.
Does not deform,
Does not crack/open up and does not rot.
Has integrated ergonomically designed lifting handles on the front and on the back, designed for comfortable carrying.
Warm in winter and cool in summer.
Suitable for all wooden Langstroth hives. 
Non-slip upper and lower surfaces 
All materials in contact with bees are food grade
To connect the parts you can use adjustable fasteners front and back