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Nanoconfinementcan profoundly change the bulk characteristics.The question of conformational changes under one-dimensional confinementis recurrent in polymer physics. Very few works addresses this questionbecause of the hard experimental challenge and the complex analysisof the signal. Here, the conformation of polystyrene chains shapedby wetting, in nanotubes or nanorods is for the first time determinedat 3 dimensions. Polystyrene chains (molecular weight samples from38 kDa to 310 kDa) confined in AAO nanopores as large as the sizeof the pore diameters (from 35 to 180 nm) are probed, revealing theinvariance with respect to the bulk-like conformation for polystyrenechainsup to 301 kDa confined downto 35 nm diameter nanopores. [ABSTRACT FROM AUTHOR]