Disclosed is a container made of plastic material including a body extending along a longitudinal axis between an opening and a base, the base having: a seat forming a setting plane for the container; a concave arch, rotational around the longitudinal axis and extending from the vicinity of the seat to an amorphous central zone; and stiffening bosses that protrude from the concave arch and that extend radially to the interior of the arch. The stiffening bosses are angularly spaced from one another by alternating first bosses and second bosses that are distributed along: a first annular band in which the first bosses extend; and a third annular band in which the second bosses extend.