WHY

Seat and backrest can be upholstered in all fabric categories E, F (except Valencia), M (except for fabric Silvertex, Stamskin Zen), O and COM+.

Models 330, 331, 340 and 341 is not possible to upholster Omega a Theo Nets.

Models 350 have backrest upholstered in Net, Theo Net, Rhytm and Omega in all offered colors.