Thermosole® is built with a special high-selectivity absorber with a vacuum layer which reduces heat loss to a minimum. Its insulation is 60 mm thick on the rear and it is also insulated at the sides so as to reduce heat loss. Its safety with respect to atmospheric agents is guaranteed by the glass with a thickness of 4 mm. Its performance is enhanced by the special prismatic treatment over the whole surface of the glass which captures the solar rays with low angles of incidence. The frame is made of anodized aluminium, a robust aluminium rear, and EPDM rubber gaskets resistant to different meteorological conditions with vulcanized corner joints