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A crosslinked olefin elastomer foam has a specific gravity of 0.05 to 0.2, an expansion ratio of 8 to 15, a compression set of 30 to 60% and a tear strength of 1.5 to 2.5 kg/cm. The crosslinked foam is obtained by heating an elastomer composition comprising a specific ethylene/α-olefin copolymer, an

A crosslinked olefin elastomer foam has a specific gravity of 0.05 to 0.2, an expansion ratio of 8 to 15, a compression set of 30 to 60% and a tear strength of 1.5 to 2.5 kg/cm. The crosslinked foam is obtained by heating an elastomer composition comprising a specific ethylene/α-olefin copolymer, an organic peroxide, a crosslinking auxiliary and a foaming agent. The crosslinked foam has a high expansion ratio, is free from surface roughening attributed to defoaming, realizes a soft touch, exhibits a low compression set and is excellent in mechanical strength (particularly tear strength) and heat resistance.

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1. A crosslinked olefin elastomer foam having a specific gravity of 0.05 to 0.2, an expansion ratio of 10.5 to 15, a compression set of 30 to 60% and a tear strength of 1.5 to 2.5 kg/cm. 2. The crosslinked olefin elastomer foam as claimed in claim 1, wherein the expansion ratio of the foam is from 1

1. A crosslinked olefin elastomer foam having a specific gravity of 0.05 to 0.2, an expansion ratio of 10.5 to 15, a compression set of 30 to 60% and a tear strength of 1.5 to 2.5 kg/cm. 2. The crosslinked olefin elastomer foam as claimed in claim 1, wherein the expansion ratio of the foam is from 11.5 to 15. 3. A crosslinked olefin elastomer foam having a specific gravity of 0.05 to 0.2, an expansion ratio of 9.8 to 15, a compression set of 30 to 60% and a tear strength of 1.5 to 2.5 kg/cm, comprising an ethylene/α-olefin compolymer. 4. A crosslinked olefin elastomer foam having a specific gravity of 0.05 to 0.2, an expansion ratio of 8 to 15, a compression set of 30 to 60% and a tear strength of 1.5 to 2.5 kg/cm, comprising an olefin elastomer, which comprises 50 to 100 parts by weight, based on 100 parts by weight of the olefin elastomer, of an ethylene/α-olefin copolymer. 5. A crosslinked olefin elastomer foam having a specific gravity of 0.05 to 0.2, an expansion ratio of 8 to 15, a compression set of 30 to 60% and a tear strength of 1.5 to 2.5 kg/cm prepared from an olefin elastomer, which comprises 50 to 95 parts by weight, based on 100 parts by weight of the olefin elastomer, of an ethylene/α-olefin copolymer. 6. A crosslinked olefin elastomer foam having a specific gravity of 0.05 to 0.2, an expansion ratio of 8 to 15, a compression set of 30 to 60% and a tear strength of 1.5 to 2.5 kg/cm prepared from an olefin elastomer, which comprises 70 to 98 parts by weight, based on 100 parts by weight of the olefin elastomer, of an ethylene/α-olefin copolymer. 7. A crosslinked olefin elastomer foam having a specific gravity of 0.01 to 0.2, a compression set of 20 to 60% and a tear strength of 2.0 to 4.0 kg/cm, comprising an olefin elastomer, which comprises 50 to 100 parts by weight, based on 100 parts by weight of the olefin elastomer, of an ethylene/α-olefin copolymer. 8. A crosslinked olefin elastomer foam having a specific gravity of 0.01 to 0.2, a compression set of 20 to 60% and a tear strength of 2.0 to 4.0 kg/cm, comprising an olefin elastomer, which comprises 50 to 95 parts by weight, based on 100 parts by weight of the olefin elastomer, of an ethylene/α-olefin copolymer. 9. The crosslinked olefin elastomer foam as claimed in claim 3 or 7, which is a crosslinked foam obtained by heating an olefin elastomer composition, the olefin elastomer composition comprising an ethylene/α-olefin copolymer (A) having a density of 0.88 to 0.92 g/cm3and a melt flow rate (measured at 190° C. under a load of 2.16 kg in accordance with ASTM D 1238) of 0.1 to 10 g/10 mm; an organic peroxide (D); a crosslinking auxiliary (E); and a foaming agent (F). 10. The crosslinked olefin elastomer foam as claimed in claim 9, wherein the ethylene/α-olefin copolymer (A) has a molecular weight distribution (Mw/Mn), as measured by gel permeation chromatography (GPC), of 2.3 to 4.0. 11. The crosslinked olefin elastomer foam as claimed in claim 9, wherein the crosslinking auxiliary (E) and the organic peroxide (D) are used in a weight ratio ((E)/(D)) of 1/8 to 3/1. 12. The crosslinked olefin elastomer foam as claimed in claim 4, wherein the expansion ratio is 10.5 to 15.