Leave in treatments, are to curly hair, as air is to your body; a complete and utter necessity. If there is one thing curls thrive on its moisture, I mean come on you see what your hair does in the humidity! There are dozens of options available, and I've tried at least a thousand. Here's a few of my favorites for your ultimate reference.
To the left Moroccan Oil - it is to die for. Super thick formula that smells great (like a tropical island) and really leaves your hair feeling smooth after a short 10 minutes treatment. It's one of the best products for keeping your hair feeling super soft. It's quick easy and the tub lasts a while, unfortunately it is expensive. Don't get me wrong most hair masques will cost you a pretty penny, but this one certainly isn't cheap.
Another great option is by It's a 10. It also has a super thick formula, and is a 10 minute apply and rinse out treatment. This is the first hair mask I ever tried, it smells delightful too, and definitely will aid with pesky split ends that have already formed. It's also great to just leave in. Sometimes I don't rinse it out and the great thing about it is there's no flaky residue from it. It simply leaves my hair silky and smooth.
If you're looking for a product to repair your split ends Joico has the ultimate ticket. K-Pak reconstruct literally reconstructs your hair stand, I have absolutely no idea how, but it worked like a charm on my hair. Now keep in mind I used it with the matching shampoo, conditioner, and blowdryer, but still -it's a great product.
My final product recommendation - is Nexxus' Promend Split End Remedy, I use it every day after I shower. It's a great treatment to prevent future split ends. Ever since I started using it I noticed that my hair would get less damaged each time I took a hot tool to it. I stopped using it for a while and the damage came back full force - I'm convinced this is my hair's current best medicine. Plus this one isn't that expensive!