  In the present work, we investigate the dipion transitions between
$\Upsilon(5S)$ and $\Upsilon_J(1D)$ with $J=1, 2, 3$. Our analysis indicates
that the dominant sources of the anomalously large widths of $\Upsilon(5S)\to
\Upsilon_J(1D) \pi^+ \pi^-$ should be $Z_b^{(\prime)}$, i.e., the dipion
transitions occur via the cascade decays $\Upsilon(5S)\to Z_b^{(\prime)\pm}
\pi^\mp \to \Upsilon_J(1D) \pi^+ \pi^-$. With the assumption that all the short
ranged dynamics could be absorbed in a single cutoff with a model parameter
$\alpha$, the present estimations indicate that in a reasonable parameter range
the measured branching ratios of $\Upsilon(5S) \to \Upsilon_J(1D) \pi^+ \pi^-$
can be reproduced in magnitude, which further proves that the decays via
$Z_b^{(\prime)}$ dominate the dipion transitions of $\Upsilon(5S)$ to
$\Upsilon_J(1D)$. Moreover, we also predict the ratios of the branching
fractions of $Z_b^{(\prime)} \to \Upsilon_J(1D) \pi$, which in our calculations
are largely independent of the parameter $\alpha$ and could be tested by
further experiments in Belle II.
