Caddis Wading Systems Affordable Taupe Explorer Wading Shoe is a great match for Caddis neoprene and breathable waders. Comes with an EcoSmart II sole that is compatible with stud kits: PRO121A and PRO221A. Concerns over the transfer of invasive species in waterways has prompted several states to pass laws banning felt soles shoes. Caddis is proud to feature the environmentally-friendly felt-free EcoSmart II Soles. These soles are a great alternative to use in any waterway.