A poly v belt comprising a body in an elastomeric material, preferably EPDM, a plurality of durable filiform inserts longitudinally embedded in the body, and a coupling portion integrally connected to the body and comprising a plurality of V-shaped ribs, side by side and alternating with V-shaped grooves.

According to the poly v belt, comprised a layer of a thermoplastic material that at least partially covers the ribs, and a knitted fabric arranged over the thermoplastic material. Preferably, the thermoplastic material comprises a polyolefin irradiated with a dose comprised between 60 and 140 kGy.