A swim diaper comprising a liquid pervious topsheet, a liquid impervious backsheet, and an absorbent core positioned in between said topsheet and said backsheet, said absorbent core having a first and second longitudinal edge (131, 132) and a front and rear transverse edge (133, 134); wherein the absorbent core comprises a top core wrap sheet and a back core wrap sheet and comprises between 30 and 160 gsm fluff pulp in between the top and back core wrap sheet; wherein the absorbent core is substantially free of superabsorbent polymers; wherein, seen in a longitudinal direction of the absorbent core, looking from the front transverse edge to the rear transverse edge, the absorbent core comprises subsequently a first, second, third and fourth zone; wherein the absorbent core comprises a front part extending between the front edge and a transverse crotch line of the absorbent core, and a rear part extending between the rear edge and the transverse crotch line of the absorbent core; wherein said first and second zone extend in the front part of the absorbent core and said third and fourth zone extend in the rear part, wherein the second and third zone together extend over a length corresponding with at least 40% of the length of the absorbent core; and wherein the absorbent core is provided with one or more reinforcement zones, where the top core wrap sheet is attached to the back core wrap sheet, extending at least partially in the second and/or third zone; wherein the one or more reinforcement zones are arranged such that for any area in the second and/or third zone having a width of 50% of a width of the absorbent core and a length of 40% of a length of the absorbent core, at least one reinforcement zone is at least partially located in said area. wherein the absorbent core comprises a top core wrap sheet and a back core wrap sheet and comprises between 30 and 160 gsm fluff pulp in between the top and back core wrap sheet; wherein the absorbent core is substantially free of superabsorbent polymers; wherein, seen in a longitudinal direction of the absorbent core, looking from the front transverse edge to the rear transverse edge, the absorbent core comprises subsequently a first, second, third and fourth zone; wherein the absorbent core comprises a front part extending between the front edge and a transverse crotch line of the absorbent core, and a rear part extending between the rear edge and the transverse crotch line of the absorbent core; wherein said first and second zone extend in the front part of the absorbent core and said third and fourth zone extend in the rear part, wherein the second and third zone together extend over a length corresponding with at least 40% of the length of the absorbent core; and wherein the absorbent core is provided with one or more reinforcement zones, where the top core wrap sheet is attached to the back core wrap sheet, extending at least partially in the second and/or third zone; wherein the one or more reinforcement zones are arranged such that for any area in the second and/or third zone having a width of 50% of a width of the absorbent core and a length of 40% of a length of the absorbent core, at least one reinforcement zone is at least partially located in said area.