Coating and fibre impregnation are studied from the theory of Landau and Levich (1942) (Acta. physicochimica USSR, 17, 42-54) Deryagin (1943) (Acta physicochemica USSR, 39,13-16) and more recent approaches of De Ryck and Quere (1996) (Journal of fluid Mechanics, 311, 219-237). Chemical and physical effects influence the impregnation. To study fibre impregnation at speeds higher than 2 m/s, a high-speed impregnation unit was developed to reach fibre velocities of 5 m/s and above. Two wetting applicators were set up and experiments on mono- and multi-filaments yam structures were conducted in order to understand the wettability and the hydrodynamic phenomena associated with impregnation at high fibre velocities. The results for the impregnation with water both in the case of the mono-filament and the multi-filament fibres differ significantly. Three hydro-capillary regimes have been identified in the case of the single fibre whereas multi-filament impregnation seems to vary in a way comparable to the Landau theoretical prediction.