661 filter spd clipless shoesfor complete comfort performance and style in a casual package look no further than these filter spd clipless shoes from 661 the softer rubber compound on the outsole of these shoes provide excellent grip when unclipped and walking yet they are stiff enough to provide great power transfer and just enough flex to be secure yet snug on long descents and in technical terrain featuresskate styled sole with spdincorporated in nylon shankskate style grip through rubbe