Fermi bubbles (FBs) are giant (~50 degrees on the sky) gamma ray bubble detected toward the center of our Milky Way. There are also radio and X-ray features associated with FBs. We have modeled FBs as a Galactic wind driven by coalescing supernovae. We focus on X-ray observations, which are simpler to interpret because power-law particles and magnetic fields (modeling radio and gamma rays requires assumptions about energetic particles and magnetic fields) are not needed to produce X-rays.