An on-machine-seamable papermaker's fabric (10, 40, 90) permeable to water and air comprising: a base fabric (14, 44, 54, 70, 80, 92), said base fabric having a system of longitudinal yarns (16, 46, 100) and a system of transverse yarns (22, 52, 58, 104), said longitudinal yarns (16, 46, 100) being substantially in the machine direction of said base fabric (14, 44, 54, 70, 80, 92) and said transverse yarns (22, 52, 58, 104) being substantially in the cross-machine direction of said base fabric (14, 44, 54, 70, 80, 92), said yarns of said system of longitudinal yarns (16, 46, 100) being interwoven with said yarns of said system of transverse yarns (22, 52, 58, 104) to form said base fabric (14, 44, 54, 70, 80, 92) in a rectangular shape with a length, a width, two lengthwise edges and two widthwise edges, said longitudinal yarns (16, 46, 100) forming seaming loops (18, 48, 98) along each of said two widthwise edges, said seaming loops (18, 48, 98) being interdigitated and joined together with a pintle (20, 50, 102), characterized in that said interdigitated seaming loops (18, 48, 98) form a single seam (12, 42, 108); and in that either a strip of flow-resistant material (24, 60, 106) is arranged over said seam (12, 42, 108) and attached thereto, or said base fabric (14, 44, 54, 70, 80, 92) has a top layer (72, 84, 94) and a bottom layer (74, 86, 96) and a strip of flow-resistant (24, 60, 106) material, between said top layer (72, 84, 94) and said bottom layer (74, 86, 96) on at least one side of said seam (12, 42, 108), said flow-resistant material (24, 60, 106) providing said seam (12, 42, 108) with permeabilities to air and water substantially identical to those of the rest of said papermaker's fabric (10, 40, 90); and wherein at least one layer of staple fiber batt (26, 62, 110) is entangled through said base fabric (14, 44, 54, 70, 80, 92). a base fabric (14, 44, 54, 70, 80, 92), said base fabric having a system of longitudinal yarns (16, 46, 100) and a system of transverse yarns (22, 52, 58, 104), said longitudinal yarns (16, 46, 100) being substantially in the machine direction of said base fabric (14, 44, 54, 70, 80, 92) and said transverse yarns (22, 52, 58, 104) being substantially in the cross-machine direction of said base fabric (14, 44, 54, 70, 80, 92), said yarns of said system of longitudinal yarns (16, 46, 100) being interwoven with said yarns of said system of transverse yarns (22, 52, 58, 104) to form said base fabric (14, 44, 54, 70, 80, 92) in a rectangular shape with a length, a width, two lengthwise edges and two widthwise edges, said longitudinal yarns (16, 46, 100) forming seaming loops (18, 48, 98) along each of said two widthwise edges, said seaming loops (18, 48, 98) being interdigitated and joined together with a pintle (20, 50, 102), characterized in that said interdigitated seaming loops (18, 48, 98) form a single seam (12, 42, 108); and in that either a strip of flow-resistant material (24, 60, 106) is arranged over said seam (12, 42, 108) and attached thereto, or said base fabric (14, 44, 54, 70, 80, 92) has a top layer (72, 84, 94) and a bottom layer (74, 86, 96) and a strip of flow-resistant (24, 60, 106) material, between said top layer (72, 84, 94) and said bottom layer (74, 86, 96) on at least one side of said seam (12, 42, 108), said flow-resistant material (24, 60, 106) providing said seam (12, 42, 108) with permeabilities to air and water substantially identical to those of the rest of said papermaker's fabric (10, 40, 90); and wherein at least one layer of staple fiber batt (26, 62, 110) is entangled through said base fabric (14, 44, 54, 70, 80, 92).