Hi Steve! The Ghost 15 has a few differences from the Adrenaline GTS 22. Most importantly, the Adrenaline GTS 22 features our GuideRails technology which adds support by keeping excess movement in check while the Ghost does not feature this support. The Ghost 15 also features soft and lighter-weight DNA LOFT v2 while the Adrenaline GTS 22 features DNA LOFT.