The present invention relates to a carpet backing layer composition, comprising: —100 parts by weight of a polyolefins or a blend of polyolefins and optionally a blend of oils, wax and tackifiers, said polyolefin or polyolefin blend comprising at least 0% by weight of (co)polymerized C3-C8 alfa-olefins—between 100 and 900 parts by weight of one or more inorganic filler(s) characterized by a volume median particle diameter (D50) comprised between 10 and 1000 μm; —the backing layer composition having a heat of fusion within the temperature range of from 10 to 40° C. (ΔH10→40° C.) that is less than 12.5% of the heat of fusion of the backing layer within the temperature range of from 10 to 170° C. (ΔH10→170° C.), the heat of fusion being measured by Differential Scanning calorimetry. The invention further relates to a carpet comprising a carpet backing layer obtained from the carpet backing layer composition and a method for the preparation of the carpet.