Sublimated upper with HF Home / Lavori / Sublimated upper with HF Sublimated upper with HF The upper was first printed by sublimation and then, through the High Frequency process (HF), it acquired the remarkable relief games you can see from the images. Share: Thanks. Linea Pelle of February 2017 Share: HF-coupled upper with red silk-screened PU and synthetic fabric Tomaia accoppiata in HF con PU serigrafato azzurro e mesh