  We show both the leading and subleading double soft theorems of the nonlinear
sigma model follow from a shift symmetry enforcing Adler's zero condition in
the presence of an unbroken global symmetry. They do not depend on the
underlying coset G/H and are universal infrared behaviors of Nambu-Goldstone
bosons. Although nonlinear sigma models contain an infinite number of
interaction vertices, the double soft limit is determined entirely by a single
four-point interaction, together with the existence of Adler's zeros.
