Tips for shaving thighs?

I can always shave my lower legs without any problems and I do it quite frequently. However, when I decided to shave my thighs as well on thursday when it was almost 35c, I got lots of razor bumps and a terrible itch on the front and part of my inner thigh, despite exfoliating, moisurizing and using lotion a couple of minutes after I was done. What can I do to prevent this? It almost looks worse than not shaving at all.