A hub bearing unit comprising an outer ring, stationary in use, an inner ring, rotating in use, having a flanged end opposite to the outer ring, at least one crown of rolling bodies interposed between the outer ring and the inner ring, and a low friction sealing assembly (1;100) insertable into an annular gap delimited between the rotating member and the stationary member, mutually coaxial, of the hub bearing unit, to protect at least one crown of rolling bodies arranged between the stationary member and the rotating member; the sealing assembly (1;100) comprising: a first annular shield provided with a first sleeve portion integral in use with the rotating member, and with a first flange portion, which radially extends so as to protrude from the first sleeve portion; a second annular shield (11;111) provided with a second sleeve portion (18;118) integral in use with the stationary member and with a flange portion (19;119) carried by the second sleeve portion (18;118) so as to protrude therefrom, radially on the opposite side of the first flange portion and facing the same; and an annular seal provided with at least a first (12;112) and a second (13;113) annular lip, which axially and radially extends so as to protrude from the second flange portion towards the first flange portion; and wherein the first flange portion ends on the opposite side of the first sleeve portion with a first annular stretch, which protrudingly radially and axially extends in use out of the annular gap to define a first labyrinth seal with the stationary member; wherein the first annular stretch is defined by a right angle folded edge of the first flange portion defining, with the first flange, an L in radial section and, in use, together with the first flange portion and the stationary member, delimits an L-shaped channel in radial section having a constant width and consisting of a first branch, delimited between the first annular stretch and a cylindrical portion of lateral surface of the stationary member and having constant axial extension and a radial width, and of a second branch, delimited between the first flange portion and a frontal flat surface of the stationary member facing the rotating member, having constant radial extension and (an) axial width, this axial width being comparable to the radia width of the first annular stretch; the L-shaped channel leading into an annular recess having a concavity facing the right angle folded edge of the first flange portion and which is delimited between the second shield (11;111) and the first lip (12;112) of the annular seal, which first lip (12;112) extends obliquely with respect to the first flange portion to cooperate with the first flange portion; characterized in that, in combination: i)- the first lip (12;112) extends so as to move away from the first sleeve portion and cooperates with the first flange portion without contact for defining with the first flange portion a second labyrinth seal; ii)- the first flange portion has a straight angle, intermediate fold defining an L in radial section, facing the opposite side of the L defined by the right angle folded edge of the first flange portion and which extends, at the outlet into the annular recess of the constant width L-shaped channel, axially protruding over the concavity of the annular recess, so as to form a drip element adapted in use to guide any external contaminants which pass the first labyrinth seal into the annular recess. i)- the first lip (12;112) extends so as to move away from the first sleeve portion and cooperates with the first flange portion without contact for defining with the first flange portion a second labyrinth seal; ii)- the first flange portion has a straight angle, intermediate fold defining an L in radial section, facing the opposite side of the L defined by the right angle folded edge of the first flange portion and which extends, at the outlet into the annular recess of the constant width L-shaped channel, axially protruding over the concavity of the annular recess, so as to form a drip element adapted in use to guide any external contaminants which pass the first labyrinth seal into the annular recess.