I used Frogg Toggs and found them to be very breathable and waterproof.  I was pleasantly surprised.  Have not used in day after day of rain though.

Be aware that there are different weights of the fabric.  Get the lightest.

However they are very fragile so don't go scooting on rocks with them.  Just normal care on the trail is all you need.  If it tears by an unseen branch use duct tape inside to repair it on trail.