A crosslinkable polyolefin composition comprising from 100 to 30 weight percent (wt%) of a carrier mixture and from 0 to 70 wt%, respectively, of one or more optional additives; wherein the carrier mixture consists of from 97.56 to 99.31 weight percent (wt%) of a polyethylene polymer, from 0.40 to 2.0 wt% of an alkenyl-functional monocyclic organosiloxane, and from 0.29 to 0.44 wt% of an organic peroxide; wherein the polyethylene polymer is selected from and: an ethylene/alpha-olefin copolymer elastomer having a melt index from 0.6 to 6.2 grams per 10 minutes (g/10 min.) and a density of from 0.854 to 0.912 gram per cubic centimeter (g/cm 3), measured according to ASTM D792-13, Method B or a blend of and a low-density polyethylene (LDPE) having a melt index of 0.8 to 2.5 g/10 min., wherein the blend has a mass ratio of weight of -to-weight of (LDPE) ( /(LDPE) wt/wt) of from 99.9/0.1 to 1.0/3.0 and wherein both melt indexes are measured according to ASTM D1238-04 (190° C., 2.16 kg; "I 2 "); wherein the alkenyl-functional monocyclic organosiloxane is of formula: [R 1,R 2 SiO 2/2] n, wherein subscript n is an integer greater than or equal to 3; each R 1 is independently a (C 2 -C 4)alkenyl or a H 2 C=C(R 1a)-C(=O)-O-(CH 2) m - wherein R 1a is H or methyl and subscript m is an integer from 1 to 4; and each R 2 is independently H, (C 1 -C 4)alkyl, phenyl, or R 1; and wherein the carrier mixture of the crosslinkable polyolefin composition has a hot creep of less than 175% after being kept at 200° C. for 15 minutes, as measured by the Hot Creep Test Method; with the proviso that the crosslinkable polyolefin composition is free of a phosphazene base; and with the proviso that if the melt index (I 2) of the ethylene/alpha-olefin copolymer elastomer is greater than 2 g/10 min., the amount of organic peroxide is from 0.35 to 0.44 wt%. wherein the carrier mixture consists of from 97.56 to 99.31 weight percent (wt%) of a polyethylene polymer, from 0.40 to 2.0 wt% of an alkenyl-functional monocyclic organosiloxane, and from 0.29 to 0.44 wt% of an organic peroxide; wherein the polyethylene polymer is selected from and: an ethylene/alpha-olefin copolymer elastomer having a melt index from 0.6 to 6.2 grams per 10 minutes (g/10 min.) and a density of from 0.854 to 0.912 gram per cubic centimeter (g/cm 3), measured according to ASTM D792-13, Method B or a blend of and a low-density polyethylene (LDPE) having a melt index of 0.8 to 2.5 g/10 min., wherein the blend has a mass ratio of weight of -to-weight of (LDPE) ( /(LDPE) wt/wt) of from 99.9/0.1 to 1.0/3.0 and wherein both melt indexes are measured according to ASTM D1238-04 (190° C., 2.16 kg; "I 2 "); wherein the alkenyl-functional monocyclic organosiloxane is of formula: [R 1,R 2 SiO 2/2] n, wherein subscript n is an integer greater than or equal to 3; each R 1 is independently a (C 2 -C 4)alkenyl or a H 2 C=C(R 1a)-C(=O)-O-(CH 2) m - wherein R 1a is H or methyl and subscript m is an integer from 1 to 4; and each R 2 is independently H, (C 1 -C 4)alkyl, phenyl, or R 1; and wherein the carrier mixture of the crosslinkable polyolefin composition has a hot creep of less than 175% after being kept at 200° C. for 15 minutes, as measured by the Hot Creep Test Method; with the proviso that the crosslinkable polyolefin composition is free of a phosphazene base; and with the proviso that if the melt index (I 2) of the ethylene/alpha-olefin copolymer elastomer is greater than 2 g/10 min., the amount of organic peroxide is from 0.35 to 0.44 wt%.