A composition can comprise: linear low density polyethylene having a melt mass flow rate as determined using ASTM D-1238 (190° C./2.16 kg) in the range from 4 to 125 g/10 min or high density polyethylene having a melt mass flow rate as determined using ASTM D-1238 (190° C./2.16 kg) in the range from 4 to 125 g/10 min and polypropylene, wherein the amount of polypropylene is from 0.005 to 10 wt % based on the total weight of the linear low density polyethylene or the high density polyethylene and the polypropylene, wherein the polypropylene has a melt temperature (Tm) from 140° C. to 200° C. and/or a crystallization temperature (Tc) from 100° C. to 140° C., wherein the Tm and Tc are determined using Differential Scanning Calorimetry according to ASTM D 3418-08 using a scan rate of 10° C./min on a sample of 10 mg and using the second heating cycle. The invention also relates to the use of the composition in injection molding.