The Simms 2009 boot line introduced Cleanstream(tm) technology to keep mud snails and other aquatic nuisance species (ANS) from hitching a ride on your boots. By using less "ride-friendly" fabrics, less exposed stitching, and fewer hideaway ridges and pockets, we'll all do our part in the fight against spreading aquatic nuisance species.
For the biggest breakthrough in years, Simms has teamed with Vibram(r) to give you super-easy to clean, great-gripping rubber compound treads on our wading boots, and river footwear. The new G4 Guide Boot(tm), Simms' Rivershed(tm), Headwaters(tm) and Freestone(tm) boots feature the Simms StreamTread(tm) design to keep you upright in the wettest, mossy conditions anywhere. The Blackfoot Boot, Pursuit shoes and sandals also feature a Vibram(r) non-marking sole.