Panel made of a combination of hemp biomass and clay. The breathability and hygrothermal capacity of the panel, used as an internal cladding, guarantees a stable and comfortable microclimate. Its high bulk density protects against the pollutant factors found in the atmosphere, reduces electromagnetic pollution offering excellent acoustic insulation and has a positive effect on the thermal lag and attenuation of the wall. It lends itself as panelling for double walls, floors and roofing.