Not sure if it falls under waterproof but it ticks every other box - The Dr Comfort Relax. Technically orthopedic/diabetic footwear but it's decently solid for a slipper, has a rubber sole and is designed for people who smash their feet into the ground with every step. The innersoles are replaceable as well so you can extend the lifespan with new innersoles as needed.
Threeflow t1_ivdj8qt wrote
Reply to Mens multipurpose slippers by dewder23
Not sure if it falls under waterproof but it ticks every other box - The Dr Comfort Relax. Technically orthopedic/diabetic footwear but it's decently solid for a slipper, has a rubber sole and is designed for people who smash their feet into the ground with every step. The innersoles are replaceable as well so you can extend the lifespan with new innersoles as needed.