Upon receiving the case, there was strong smell due to silicone material. Im a 56yo IT tech, so I consistently use different keyboards for decades. Have in numerous colors. If you work in an environment where your standing allday these are the shoes for you! Disappointed they were almost a full size too big, they don?t come in a 9 1/2, leather very nice, arch support not as much as their flipflops the performance of my computer has increesed and I can say the ram speed is above average. I am an ex Ferragamo addict. However, I love these silver pair so much that I purchased a second pair for next summer (incase the first pair look too worn next year). Comfortable to wear and not so big that they look ridiculous! But these excel as studio monitors.