I like the convertibles, too. Like JR says you can unzip halfway at the knees. They are also cargo pants which I really like for maps, compass, lunch bars, 500ml water bottles, lighter, knife, Steripen, etc. Stuff I always carry with me. Do no overload the pockets though. They can be tough to carry all day.
I purchased several pair for hiking about 10 years ago from EMS(5pr.) They weigh about 14oz (good for any pants) are 100% nylon (they take permethrin well), quick drying (stream crossings and trail “laundry” is easy), bug proof (even mosquitoes cannot bite through them,) fairly resistant to thorns, and highly resistant resistant to wear (I wear them daily.) They run about $69 dollars now. They have a built in belt. The used to have a side clip, which I really like. New ones have a front clip.
I rarely take the bottom section off. On wet trails, sometimes I do split them to let them dry a bit quicker. They have the bottom zips so getting them off/on over boots works well. I do not normally get gear from EMS, but their clothing is fine (Smartwool base layers, pants, socks etc.)