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Yoga mats are ok but tend to curl. I found the best things are a 4 piece puzzle fatigue mat I found at ocean state job lot for $9.00 and they come flat. You get 3 out of each square ( 4 in a pack). using a five gallon bucket as a template. They are about 3/8" thick and work well .Front and back picture.
How well do they work RJ?
Question, if it's really windy, won't the hole cover lift and blow off the hole? I would think a tip up wouldn't hold them down.Second question, when it's really cold and you just cut the hole, do you have to wait for the water on the ice to freeze before using the covers? I imagine they would freeze to the ice.
I myself have not used hole covers. But I did see a fellow fisherman using 5 gallon buckets as hole covers. He placed the buckets over his holes upside down and then had holes in the bottoms big enough for the spool on his tip ups to fit through and just set the tip up on top of the bottom of the bucket. I thought it was a neat idea. hope this helps
Thanks for the ideas, I'm wondering if these would work, they're only a 1/2" thick:https://www.amazon.com/Yes4All-Interlocking-Exercise-Foam-Border/dp/B07BF7F2PN/ref=sr_1_12_sspa?ie=UTF8&qid=1547647649&sr=8-12-spons&keywords=interlocking+floor+mats&psc=1