ââââââPropet Sentry is a rugged work boot for any task. These waterproof booties have Crazy Horse leather and mesh uppers, EVA midsole and durable rubber outsole. A padded collar and tongue, abrasion resistant rubber toe cap and removable footbed will make these work boots a daily staple. Crazy Horse Leather and Mesh Upper. EVA Midsole. Padded Collar and Tongue. Rubber Outsole.