Most of the times the hair if it is a figure goes to People>genesis(male/female) ( be it 1 2 or 3) there you will find a sub category hair. Click on it, if you look at the lower panel on your left side you'll see the hair double click to load it. If you look at the hair category you'll find on the righ side another sub category called mats, this one could be divided in either iray or 3dlight( depending on the user) choose the one you need and you can then select your mats on the down left panel. Poses would be in the same category except now it is in the pose sub folder.

I included a screenshot for you to follow...