The Holly is all about adaptability. You can turn this clog into a slingback if you need more security, depending on the job at hand. It even adjusts for a more customized fit, with its twin gore entry and a hook-and-loop heel strap. Plus, the removable Ortholite® footbed and moisture-wicking DriLex® give you all-day comfort. And, no matter what you may spill on it, there’s no need to worry with its stain-resistant, man-made uppers. It’s the two-in-one shoe that’s all-around accommodating.2" Heel HeightAdjustable hook and loop closure allows for personalized comfort and fitDri-Lex® Lining offers superior "sweat" control and will keep feet dry and comfortable in wet or damp conditionsNylon stability shank embedded into midsole supports the arch and helps create a smoother gaitOrtholite® insole wicks moisture for cool, dry comfortRemovable Ortholite® footbedSATRA TM144 rated in Dry, Wet, Oil, Oil/Wet ConditionsSlip resistant outsole properties are tested under ASTM F 2913-11, which meets or exceeds a result of 0.7 for dry and wet conditions, and 0.5 for oily/wet and soapy conditionsSynthetic PU upper provides a soft touch yet is durableThe industry uses standards test like the ASTM F2913-11, Mark II to measure the effectiveness of footwear in wet, oily, dirty conditions or some combination thereof. This tests measures the amount of friction between a shoe material with the surface under it when pressure is applied. ASTM F2913-11, Mark ll uses a scale of 0 (being not slip resistant) to 1 (being extremely slip resistant) to measure the coefficient of friction found by dividing the horizontal force by the vertical force.