Here is a blog I found on niketalk a few years back that talks about sneaker care and maintenance. It talks about how to store your sneakers, best products to clean them with and how to clean certain numbered jordans. It also tells you how to use sea glow, and why you shouldn't use saran wrap...
Your soles are going to turn yellow no matter what. Your space jams for instance, the icey sole becomes less icey after each wear. It really depends on how often you wear them, and if you clean the soles or not after each use. If you wear them on an everyday basis instead of every now and then...
Wrapping your shoes in plastic wrap or storing them in ziplock bags is sort of like suffocating them. It doesn't let any air in, which makes the leather on the shoes dry up a lot quicker allowing it to crack and turn yellow a lot faster than usual. Try storing your shoes in a cool place like...