The upper is made of highly elastic Flyknit, and the outsole is a thin waffle with clear textured patterns. (There is wear and tear near the heel due to abrasion.) It has a thin, foot-hugging, tabi-like feel. The insole is thicker than I expected, and the FREE cut-out structure makes it flexible and provides good grip on the floor. I usually wear a US 9.5 in Nike, but these shoes have a snug fit, so even a US 10.5 fit me perfectly. Although 10 years have passed since their release, they are in good condition. I kept them for indoor activities rather than outdoor use, so they have been used infrequently. The Flyknit upper shows almost no signs of wear. I have cleaned them for sale, but please consider purchasing with an understanding of their age.