When I first got my K, I did once ride it with strong trainer type shoes until I bought riding boots and I can give you the words of warning:
1. Riding boots are an essential part of your safety gear ATGATT.
2. If you have ever had road junk jump up at you, it hits your toe or ankle which is why you need protection above the ankle aka 'boots'.
3. When you come to stops on the big heavy K or are loading up a pillion, you must be sure your feet are firmly planted else tipover, expense greater than proper boots and embarrasment.
4. When you come to stops in wet weather, you realize that the soles of motorcycle riding boots are made of soft rubber similar to your road tires. Not some plastic polyurethane that will slip away.
5. Boots need to be comfortable for walking in 'off the bike' - allow up to 4 weeks to 'wear in' new boots.
I was not interested in the flashy color matched expensive riding boots and my first pair were Dainese touring boots. Plain black, zipper sides with velcro top flap, so easy to get on and off and very comfortable. The only downside was being a soft rubber sole, the right boot eventually wore a hole caused by the K's center stand. I also had to modify them slightly with an angle grinder, because they extended the sole ribbing too far back and the last one caught on the K's foot pegs.
I have seen similar non-branded boots and by look and feel for flexibility on the uppers, sole and sliding the sole/heel on a wet surface, I can tell if they would work for me. I would always prefer leather/rubber soles if I can get them over plastic composite materials.
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