Men's Teva, Katavi Slide

My 84 year old father still goes to gym every day to get in hot tub. The floor is quite slippery and he was falling. Due to arthritis he cannot bend over and tie shoes and needs slip ons. These were only shoes I could find that are slip ons, that were comfortable, and had good tread to keep him from falling and hurting himself on the wet tile floors. Thank you.

I own 10 dffirent slides or flip flops. I have a foot/ankle issue from a bad surgery and can't wear shoes muchThese are non binding but stay on well and the most comfortable I own.