From ECCO, the Men's Gruuv Easy Knit Slip On Sneakers feature: Stretchy knitted upper, for breathability and snug fit Step in effortlessly with the easy-slip function Removable dual-fit comfort foam insoles covered in breathable textile.  This unique feature allows for a customizable width ECCO FLUIDFORM™ provides soft, flexible and fluid movement within a naturally supportive anatomical fit Soft, ultra-light PHORENE™ midsole for bounce and energy return Dynamic two-way flex rubber outsole that not only provides you grip but full use of your at any angle Imported.