I like the square interlocking 2x2' from home depot, top surface is tough, easy to clean and very warm. Cut to the right width, easy to cut around posts etc. 20$ did my whole boat and left me two spare tiles. Not too hard not too soft, designed for standing on, and one section can easily be replaced if damaged.
Instant difference in warmth in the boat at floor level, not such a divided temperature range anymore. I meant to carpet over top, but this is easy to clean, and great under foot.
Keeps smells down, and small screws and parts out of the bilge. Easy to lift every square individually for access to hatches, one of the many reasons I scrapped the carpet idea.
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