UV protection for leather goods?

Kate Spade leather bag

while shielding my eyes and face from the strong sun rays today... I noticed that my leather bag was exposed to the sun... since it was a very sunny day, I actually worried whether there is some kind of treatment or spray to prevent the UV rays from hurting my leather bag... 

leather boots

I'm not a scientist nor leather expert... so it might sound silly or even stupid... but wouldn't the sun discolour your leather goods if you don't take care of them?

If so... does such a spray exist or is this still a new idea?