These things are comfortable right out of the box! The pull chord lace is not elastic, which seems a bit strange, but it cinches down to your foot just fine for a comfortable fit. The materials are extremely lightweight and breathable. On a windy day you can feel it in your feet as if nothing were there. I generally wear a size 10 in everything, but went to a size 10.5 on these based on other reviews. They fit well, but i think i could have gotten away with wearing the size 10. They dont hold water at all, the material dries quicky, and the soft eva padding on the back is amazing to fold down the back of the shoe and wear as a slip on right out of your tent. Trip to havasupai, i wore these as a hiking shoe for the 10 mile hike in, all week as a water shoe, and hiked 10 miles out with them. Comfort support, no blisters, etc. I like!