Method of forming a multi-layered fiber

A method of forming a multi-layered fiber comprising:

• a) forming an elongated core having an exterior surface comprising polypropylene;
• b) applying a first layer to at least a portion of the core, wherein the first layer comprises a first polymer, wherein the first polymer comprises a polymer having at least 70% α-olefin units and is characterized by a melting temperature less than the melting temperature of the exterior surface of the core;
• c) applying a second layer to at least a portion of the first layer, wherein the second layer comprises a second polymer, wherein the second polymer comprises a co-polymer having at least 50% α-olefin units and is characterized by a number-average molecular weight of about 7,000 g/mol to 50,000 g/mol, a viscosity of between about 2,500 and 150,000 cP measured at 170° C., wherein the viscosity of the second polymer is not greater than about 10 percent of the viscosity of the first polymer measured at 170° C., and has a melting temperature lower than the melting temperature of the exterior surface of the core
• wherein the percentage by weight of the second polymer to the total weight of the fiber is between about 0.25% wt and 50% wt.