Thanks for all the comments. I have a pair of keens - https://www.rei.com/product/772930/keen-targhee-ii-mid-hikin... - probably 5 years old and I haven't replaced the soles yet and put a good amount of mileage on them. I've only actually lost one toenail once, but it took about a year to grow back and my big toes do hurt like hell after most hikes and get some small bruising on the big toes after long hikes. I've never thought about the foot swelling when hiking you all are probably right! They're too small when hiking. I'll size up.