This build focuses on Doing tons of damage, with some late game tankiness. As well as a powerful early game.

I take standard damage Msteries, while grabbing a little extra EXP gain and armor.

Marks: Originally i used Armor Pen marks as well as quints, but decided on flat Ad marks instead. My reason being, Extra armor pen has really no purpose in the jungle because most monsters have no more armor then about 15. Additionally, Lee Sin has the best AD ratios in the game. So utilizing that is key to maximizing him.

Seals: Honestly You can use other things as well. Armor seals is a viable option. I just use hp seals cause its good enough for my needs.

Glyphs: Because my build does not have any MR besides Mercury Treds, It is key that you build MR PER LEVEL glyphs. This allows you to survive late game team fights, while not giving you uneeded MR in jungle.

Quints: I grab armor pen quints because it gives you just enough armor pen for the jungle (with the armor pen mastery: "Sunder")

I take smite for jungle speed and late game steals.

Flash is great on lee sin. Ghost is a viable option as well but i find flash works better with ganking. For example i usually (depending on how pushed the lane is) Flash into them, and follow up with a quick tempest, and cripple. Typically the enemy flashes away(or ghosts). Now its time to cast sonic wave and follow up with resonating strike for the kill.

I Start at the golems, either mine or the enemies (depending on who the enemy jungler is)
After golems, i gank top at level 2. Depending on the success i will return to base or go back into jungle. Really thats the only essential part of the jungle. Just make sure to give blue to either the mid mage, or the support.

Because Sonic wave is a reactivating skill, You deal the damage of the ability twice. Making it a good option to level first. If you are having trouble landing your skill shots, leveling up the other abilites first is viable as well.

I start off the game with Boots of speed and health pots. The hp pots give me all the jungle power i need, and the boots of speed make a HUGE difference in ganking.

Next wriggles lantern is an incredible item, giving you free wards for dragon (or baron), significantly increased jungle speed, and enough life steal to keep you in the jungle forever.

Brutilizer (followed by Yrumas Ghostblade) Is not the only viable options, but i find the armor pen, cdr, critchance and extra chasing power is very effective on lee sin.

Mercury Treds i have found to be the best option on lee sin. The tanacity is extremely good during teamfights, and the MR adds to his late game.

Frozen Mallet is a fantastic item on any physical damage dealer. The chasing power is awesome, it gives you a little AD and significantly adds to your durability.

Atmas Impaler is great for the extra armor, crit chance, and really makes buying frozen mallet worth it. My frozen mallet is now giving me 34 AD.

Infinity Edge is not the only viable option. I Love how it makes use of my other crit chance items. Other viable options are:
Blood Thirster
Trinity Force. The only problem i have with this item, is the phage proc is wasted.

Well Thanks for checking out my Lee Sin Jungle build. Make sure to vote and let me know what you think in a comment. I dont think im the greatest League of legends player ever, And would like your feedback :)

-Dedejoe12