An electrical connector includes an insulative housing with a plurality of passageways and a plurality of contacts received therein. The housing includes opposite mating surface and mounting surface in the vertical direction. The contact includes an upstanding section retained in the passageway with a spring arm extending from an upper region of the upstanding plate and above the mating surface, and a mounting leg extending from a lower region of the upstanding plate around the mounting surface. The spring arm forms a contacting section around a free end thereof. One additional layer structure extends backwardly from a front end of the spring arm in a compressive folded manner and intimately abuts against the spring arm in the vertical direction.