Very comfortable. I’ve have several pairs of Chaco’s & OluKais. They are very similar in some area & different in others. 1 Similar in arch, while a bit more stiff with the sole. 2 The sole on the OluKais are more cushioned and seem to bend more easily. The Chaco soles are more firm and less flexible. While both have well supported lugs. 3 They stay on. Both have a strap the is far back enough in the foot where, like most flip flops, they do not require a lot of toe curl to hold on to the flip flop so you don’t walk out of them. 4 I try to remain disciplined enough to walk a few miles each morning. There is nothing like a summer morning walk in “flippies.” I can’t make it a mile in the Chico's before I start blistering. I don’t have an issue with OluKais. The straps are softer and the soles more flexible. In consideration of the pros and cons, to me, the winner, given the ones I have tried, and my personal favorite is OluKai! Every pair if tried is more comfortable than other shoes or remaining barefoot and more comfortable than anything else I can remember wearing.Size is true for me despite the reviews saying they run small. I think it has something to do with your toe length. They look great. Fit great. Day one, during the break-in. I walked over a mile in them without issues. These are pretty fancy flippies, so I’m not likely to do a long walk with them. I’ll wear my older OluKais for that, but these are a joy to wear. Another 30+ miles this week in my Ohana OluKais this week.OluKai knows and gets my feet and earned my business!!! Sorry Chacos. My feet have spoken!?