Boundary BootThe purpose built NRS Boundary Boot delivers knee high waterproofness with a super grippy, rugged sole to handle the harsh terrain, mucky launch sites and soggy portages. 5 mm neoprene upper with liquid sealed exterior seams and taped interior seams guarantees warmth and dry feet. Comfy 7 mm neoprene insole atop a high traction wrap up sole provides maximum protection and support. 2 mm plastic shim for even more protection from sharp, pointy objects.