massive galaxy at $z \sim 3.5$. Also plotted is the median rest-frame SED of the $H-K$-selected sample at $z\sim3.7$ from @brammer07. Figure \[fig-restframe\] clearly shows that the rest-frame optical SED of the $H-K$-selected sample and our mass-selected sample are very similar, characterized by strong rest-frame optical breaks. In contrast, their rest-frame UV SEDs are very different. The $H-K$-selected galaxies are characterized by very blue rest-frame UV-optical colors. On the contrary, our mass-selected galaxies are generally red also in the rest-frame UV.

The significant differences in observed and rest-frame properties between the $H-K$-selected galaxies at $z\sim3.7$ from [@brammer07] and the very massive galaxies at $3.0 \leq z < 4.0$ selected in our study are very interesting, as most of our galaxies would also be selected as $H-K$ galaxies. The simplest explanation for the observed differences is the very different regime in stellar masses probed by the two samples. The $H-K$ galaxies from @brammer07 were selected from the FIRES survey over an area of $\sim31$ arcmin$^{2}$, with a median stellar mass a factor of $\sim15$ smaller than the median stellar mass of our mass-selected sample. The lack of very massive galaxies in FIRES is simply caused by its very small surveyed area, 