A press felt, comprising: (a) a triple layer base fabric (102; 300) comprising a plurality of repeat units, each of the repeat units comprising a plurality of exterior machine direction yarns (110-113; 310-313), each of which includes an upper run (110a-113a; 310a-313a) and a lower run (110b-113b; 310b-313b) merging with seam loops (110c-113c) at each end, a plurality of middle MD yarns (115, 116; 315, 316), each of the middle MD yarns forming two generally parallel runs (115a, 115b, 116a, 116b; 315a, 315b, 316a, 316b) which are connected by a loop and are each disposed between the upper and lower runs of one of the exterior MD yarns, and a plurality of cross machine direction yarns (104-107; 302-305) interwoven with the exterior MD yarns and the middle MD yarns in a predetermined regular weave pattern, the seam loops defining the longitudinal ends of the press felt; and (b) a batt layer overlying the base fabric; characterised in that: - each repeat unit is formed by four exterior MD yarns, two middle MD yarns and four CMD yarns; and - each CMD yarn interweaves with the MD yarns in the following manner: each CMD yarn passes over an upper run of an exterior MD yarn, passes under the upper run of the adjacent exterior MD yarn but above the run of the middle MD yarn directly below, passes under the lower run of the next adjacent exterior MD yarn, and then passes either: i) above the lower run of the next exterior MD yarn but below the corresponding run of the middle MD yarn; or ii) above the lower run of the next exterior MD yarn and above the corresponding run of the middle MD yarn but under the upper run of the exterior MD yarn, and - in each repeat unit, the CMD yarns are offset to pass over a different upper run of an exterior MD yarn. (a) a triple layer base fabric (102; 300) comprising a plurality of repeat units, each of the repeat units comprising a plurality of exterior machine direction yarns (110-113; 310-313), each of which includes an upper run (110a-113a; 310a-313a) and a lower run (110b-113b; 310b-313b) merging with seam loops (110c-113c) at each end, a plurality of middle MD yarns (115, 116; 315, 316), each of the middle MD yarns forming two generally parallel runs (115a, 115b, 116a, 116b; 315a, 315b, 316a, 316b) which are connected by a loop and are each disposed between the upper and lower runs of one of the exterior MD yarns, and a plurality of cross machine direction yarns (104-107; 302-305) interwoven with the exterior MD yarns and the middle MD yarns in a predetermined regular weave pattern, the seam loops defining the longitudinal ends of the press felt; and (b) a batt layer overlying the base fabric; - each repeat unit is formed by four exterior MD yarns, two middle MD yarns and four CMD yarns; and - each CMD yarn interweaves with the MD yarns in the following manner: each CMD yarn passes over an upper run of an exterior MD yarn, passes under the upper run of the adjacent exterior MD yarn but above the run of the middle MD yarn directly below, passes under the lower run of the next adjacent exterior MD yarn, and then passes either: i) above the lower run of the next exterior MD yarn but below the corresponding run of the middle MD yarn; or ii) above the lower run of the next exterior MD yarn and above the corresponding run of the middle MD yarn but under the upper run of the exterior MD yarn, and each CMD yarn passes over an upper run of an exterior MD yarn, passes under the upper run of the adjacent exterior MD yarn but above the run of the middle MD yarn directly below, passes under the lower run of the next adjacent exterior MD yarn, and then passes either: i) above the lower run of the next exterior MD yarn but below the corresponding run of the middle MD yarn; or ii) above the lower run of the next exterior MD yarn and above the corresponding run of the middle MD yarn but under the upper run of the exterior MD yarn, and i) above the lower run of the next exterior MD yarn but below the corresponding run of the middle MD yarn; or ii) above the lower run of the next exterior MD yarn and above the corresponding run of the middle MD yarn but under the upper run of the exterior MD yarn, and - in each repeat unit, the CMD yarns are offset to pass over a different upper run of an exterior MD yarn.