Foamed pressure-sensitive adhesive layer based on polyvinylaromatic-polydiene block copolymers, especially for double-sided self-adhesive tapes, comprising a) 39.8 wt% to 51.8 wt% of an elastomer component, b) 35.0 wt% to 58.0 wt% of a tackifier resin component, c) 2.0 wt% to 15.0 wt% of a plasticizer component, d) 0.0 wt% to 18.0 wt% of further additives and e) microballoons, preferably in an amount of 0.2 wt% to 2.5 wt%, where the microballoons are in an at least partly expanded state, where the elastomer component (a) consists at least 90 wt% of one or more polyvinylaromatic-polydiene block copolymers, where the mean diblock fraction, based on the total polyvinylaromatic-polydiene block copolymers, is at most 35 wt%, where the polydiene blocks of the polyvinylaromatic-polydiene block copolymers have a mean vinyl fraction (test IX) of less than 20 wt%, based on the total polydiene blocks, and where, based on the total polyvinylaromatic-polydiene block copolymers, at least one polyvinylaromatic-polydiene block copolymer with a peak molar mass (test Ia) of at least 125 000 g/mol is present at at least 15 wt%, preferably at least 25 wt%, and up to 100 wt%, preferably at most 90 wt%, where the tackifier resin component (b) comprises at least 75 wt%, based on the tackifier resin component, of at least one tackifier resin having a DACP (test II) of at least -20°C and a softening temperature of at least 85°C and at most 140°C (test IIIa), where the plasticizer component (c) comprises at least one plasticizer resin and/or mineral oil each having a softening temperature (ring & ball, test VI) of < 30°C, where the sum of tackifier resin component (b) and plasticizer component (c) is at least 48 wt% and at most 60 wt% and the harmonic mean of the softening temperature (test IIIb) of tackifier resin component and plasticizer component is at least 95°C and at most 125°C, and where the density (test XI) of the foamed pressure-sensitive adhesive layer is at least 600 kg/m 3 and at most 950 kg/m 3. a) 39.8 wt% to 51.8 wt% of an elastomer component, b) 35.0 wt% to 58.0 wt% of a tackifier resin component, c) 2.0 wt% to 15.0 wt% of a plasticizer component, d) 0.0 wt% to 18.0 wt% of further additives and e) microballoons, preferably in an amount of 0.2 wt% to 2.5 wt%, where the microballoons are in an at least partly expanded state, where the elastomer component (a) consists at least 90 wt% of one or more polyvinylaromatic-polydiene block copolymers, where the mean diblock fraction, based on the total polyvinylaromatic-polydiene block copolymers, is at most 35 wt%, where the polydiene blocks of the polyvinylaromatic-polydiene block copolymers have a mean vinyl fraction (test IX) of less than 20 wt%, based on the total polydiene blocks, and where, based on the total polyvinylaromatic-polydiene block copolymers, at least one polyvinylaromatic-polydiene block copolymer with a peak molar mass (test Ia) of at least 125 000 g/mol is present at at least 15 wt%, preferably at least 25 wt%, and up to 100 wt%, preferably at most 90 wt%, where the tackifier resin component (b) comprises at least 75 wt%, based on the tackifier resin component, of at least one tackifier resin having a DACP (test II) of at least -20°C and a softening temperature of at least 85°C and at most 140°C (test IIIa), where the plasticizer component (c) comprises at least one plasticizer resin and/or mineral oil each having a softening temperature (ring & ball, test VI) of < 30°C, where the sum of tackifier resin component (b) and plasticizer component (c) is at least 48 wt% and at most 60 wt% and the harmonic mean of the softening temperature (test IIIb) of tackifier resin component and plasticizer component is at least 95°C and at most 125°C, and where the density (test XI) of the foamed pressure-sensitive adhesive layer is at least 600 kg/m 3 and at most 950 kg/m 3.