661 filter flat mtb shoesfor complete comfort performance and style in a casual package look no further than these filter flat mtb shoes from 661 the softer rubber compound on the outsole of these shoes provide excellent grip when walking yet they are stiff enough to provide great power transfer and good flex to grip the pedals featuresskate styled soleincorporated in nylon shankskate style grip through rubber solelace coverage and adjustability from lace keeper designdurability from synthet