Blundstone - 550 Chelsea Leather Boots are a high quality leather boot that will last for years. For a comfortable fit and for easy putting on and taking off the boots, Blundstone has chosen to have elastic bands on both sides of the instep. As a cool bonus, the outer leather has resistance to both acid and oil, so you don't have to worry about the well-being of your boots. The soles withstand up to 140 degrees heat, so if you are in a very hot environment, you can still wear your boots. Blundstone goes all in on comfort, including a PU midsole and a removable comfort sole that will make walking extra comfortable. There is XRD technology in the outsole for extreme shock absorption, which means that they dissipate up to 90% of energy when affected by high loads. In addition, the outer sole has resistance to microbial and hydrolysis attacks. If you oscillate between two sizes, choose the smaller size for a better fit.