Tyre for vehicle wheels, comprising a tread band having a radially outer surface on which a tread pattern is formed comprising: at least one circumferential sipe extending according to a substantially continuous extension; wherein in a radial section of the tyre said circumferential sipe has, starting from the radially outer surface of the tread band, a profile comprising: a first zone close to said radially outer surface, comprising side walls facing one another and substantially parallel, and having a minimum width W1; a second zone, radially inner with respect to the first zone, having a portion (Pt) in which the facing side walls diverge from one another, and a portion of maximum width (Pmax) in which the sipe has a maximum section width W2; and a third zone arranged radially inner with respect to the second zone and having a maximum width W3; wherein in the third zone the facing side walls of the circumferential sipe join with a bottom portion (Pf) defining a total depth of the sipe equal to or greater than 10 mm; wherein W3 is less than W2; wherein the ratio between W2 and W1 is greater than 1 and equal to or less than 2; wherein a geometric centre of said portion of maximum width (Pmax) lies at a depth greater than 40% and less than 60% of the total depth of the sipe, wherein the second zone has a joining portion (Pr) in which the side walls of the circumferential sipe converge with one another towards the third zone, and wherein the portion of maximum width (Pmax) extends radially according to an amount not greater than 25% of the total depth of the sipe. at least one circumferential sipe extending according to a substantially continuous extension; wherein in a radial section of the tyre said circumferential sipe has, starting from the radially outer surface of the tread band, a profile comprising: a first zone close to said radially outer surface, comprising side walls facing one another and substantially parallel, and having a minimum width W1; a second zone, radially inner with respect to the first zone, having a portion (Pt) in which the facing side walls diverge from one another, and a portion of maximum width (Pmax) in which the sipe has a maximum section width W2; and a third zone arranged radially inner with respect to the second zone and having a maximum width W3; a first zone close to said radially outer surface, comprising side walls facing one another and substantially parallel, and having a minimum width W1; a second zone, radially inner with respect to the first zone, having a portion (Pt) in which the facing side walls diverge from one another, and a portion of maximum width (Pmax) in which the sipe has a maximum section width W2; and a third zone arranged radially inner with respect to the second zone and having a maximum width W3; wherein in the third zone the facing side walls of the circumferential sipe join with a bottom portion (Pf) defining a total depth of the sipe equal to or greater than 10 mm; wherein W3 is less than W2; wherein the ratio between W2 and W1 is greater than 1 and equal to or less than 2; wherein a geometric centre of said portion of maximum width (Pmax) lies at a depth greater than 40% and less than 60% of the total depth of the sipe, wherein the second zone has a joining portion (Pr) in which the side walls of the circumferential sipe converge with one another towards the third zone, and wherein the portion of maximum width (Pmax) extends radially according to an amount not greater than 25% of the total depth of the sipe.