Verified answer

From the Call of duty Wikia:

The player gets to keep reticles, emblems, and backgrounds. If the player bought the ability to add their emblem or clan tag to a weapon, then they will retain that ability but won't be able to use it until they reach the level required.

The player's CODPoints balance prior to prestiging will be reset to 0 CODPoints. Also, everything apart from the things mentioned above are reset and must be repurchased; Pro versions of perks must be unlocked again, which can be a real downside if many in-game hours and manual labor were put into getting Pro versions.

You lose everything I have prestiged 4 times ahah

Everytime Man

each time you prestige you loose everything including your cod points

every time its crazy

every time