The memory foam out of the package is like walking on a cloud though! Bose support is off the hook good! i recently built my own router table and wanted to add two miter bar t track rails. Quedan como se esperan, no las tuve que ajustar y me quedaron perfecto. I wonder if I received a defect or if the quality of the shoes are this poor. Pulleys are smooth and quiet and I enjoy using it. I tested it while a vacuum is on, it managed to cancel off about 90% I would say of the noise from a vacuum cleaner, leaving some higher frequencies which is still audible. Does it?s job well! Ive been a music fanatic all my life, albeit a poor one. Attempted 2 different sizes because I liked the look and still uncomfortable.