Sockwa G4 Minimal Barefoot Shoes Lycra/Neoprene/Nylon upper Pull-on barefoot shoes ready for running, walking, beach wear, river crossings, and more 2mm neoprene for warmth and protection, with lycra tongue for breathability and flexibility. Exclusive TPU Sockwa sole to provide extreme tactility and excellent wet-slip grip. Thin but strong sole provides close to barefoot feel unique to Sockwa. Designed for use on concrete or anywhere else extreme grip and feel are required. Crushable, flexible, durable, minimal - and machine washable!