An absorbent core comprising: a front portion; a back portion; a middle portion position between the front portion and the back portion; and a longitudinal axis extending along a length of said core and crossing said front, middle and back portions (122, 126, 124), the absorbent core having a width extending perpendicular to said length and a perimeter comprising at least two opposing ends (102, 103) and at least two opposing sides (104, 105) positioned between said ends (102, 103) wherein the absorbent core comprises one or more channels having a first shape when the absorbent core is in dry state and a second shape when the absorbent core is in wet state and said first and second shapes are different, and characterized in that said core comprises at least one core wrap substrate enclosing one or more absorbent materials therein, said absorbent material being selected from the group consisting of super absorbent polymers, cellulosic fibers, and combinations thereof, and wherein a top layer of the core wrap is adhered to a bottom layer of the core wrap to form an interconnected absorbent material-free channel(s) 106 such that regions where top and bottom layers are not bonded comprise said absorbent material therebetween and regions where the top and bottom layers are bonded together are substantially free of absorbent material to from channels within said absorbent material of the core, wherein the adhered top and bottom layers of the core wrap have a first bond in at least two distinct regions of the channel(s) 106 and a second bond in at least one other region of the channel(s) 106 connecting said at least two distinct regions, and wherein said second bond is arranged to break upon liquid saturation and/or expansion of the absorbent material whilst the first bond is arranged to remain intact upon liquid saturation and/or expansion of the absorbent material, and wherein at least one of said interconnected channels forms a shape having a closed end in the form of a U-bend. a front portion; a back portion; a middle portion position between the front portion and the back portion; and a longitudinal axis extending along a length of said core and crossing said front, middle and back portions (122, 126, 124), the absorbent core having a width extending perpendicular to said length and a perimeter comprising at least two opposing ends (102, 103) and at least two opposing sides (104, 105) positioned between said ends (102, 103) wherein the absorbent core comprises one or more channels having a first shape when the absorbent core is in dry state and a second shape when the absorbent core is in wet state and said first and second shapes are different, and characterized in that said core comprises at least one core wrap substrate enclosing one or more absorbent materials therein, said absorbent material being selected from the group consisting of super absorbent polymers, cellulosic fibers, and combinations thereof, and wherein a top layer of the core wrap is adhered to a bottom layer of the core wrap to form an interconnected absorbent material-free channel(s) 106 such that regions where top and bottom layers are not bonded comprise said absorbent material therebetween and regions where the top and bottom layers are bonded together are substantially free of absorbent material to from channels within said absorbent material of the core, wherein the adhered top and bottom layers of the core wrap have a first bond in at least two distinct regions of the channel(s) 106 and a second bond in at least one other region of the channel(s) 106 connecting said at least two distinct regions, and wherein said second bond is arranged to break upon liquid saturation and/or expansion of the absorbent material whilst the first bond is arranged to remain intact upon liquid saturation and/or expansion of the absorbent material, and wherein at least one of said interconnected channels forms a shape having a closed end in the form of a U-bend.