[4][1] Severals musicians and producers were involved in the making of the tracks, including Bresh, Dardust, Edwyn Roberts, Fabio Ilacqua and La Rappresentante di Lista.

Ferrari was impressed by the collaborations with La Rappresentante di Lista and Bresh, finding instead "Caro amore lontanissimo "the most surprising" of the project, appreciating the writing of Sergio Endrigo.

[7] Alessandro Alicandri of TV Sorrisi e Canzoni compared the album with the previous Materia (Terra), explaining that in the latter Mengoni managed to describe himself "in the most intimate and profound way possible" with a soulful musical production and songs with a "writing made of analysis, without filters; [...] therefore linked to a moment in life where isolation forced him to get in touch with his fragilities," while with Materia (Pelle) he denotes a willingness to "blossom from that ground, looking out and looking at himself from the outside, with new awareness," calling the songs "decidedly pop and more electronic than the previous record; [...] it makes unusual sounds palatable."

At the end of the comparisons, the journalist questioned the choice of titling the second volume Pelle, considering it the quintessence or ether of the four elements of philosophy, that is, "something that on the one hand contrasts in all respects with the solidity of the earth and is in fact impalpable, often associated with the life force, to which the skin somehow turns out to be a witness.

"[8] Fabio Fiume of All Music Italia, conversely, expressed a more negative opinion of the record, finding the presence of "potential hits if you listen to them individually" that are, however, on the whole "disappointing."