They're convertible, but as far as bang for the buck goes, I really like White Sierra pants: https://www.amazon.com/gp/product/B00A8GVY1U

I've worn them out on several hikes and they've always done well. They're thin and a little billowy too, so they stay cool and comfortable. Only complaint about them is that the belt that comes with them is pretty useless, but it's not attached or anything so you can just not use it. I think they run a little small in the waist, but they do have some stretch to them.