I've been using Reflectix and am pretty happy with it. Hard to see but I used duct tape to make a flap all the way around, so there is a pretty good seal and the small opening on the right side can be covered during shed to help hold in moisture.
Also used sphagnum moss but find it ends up everywhere so instead have tried this lo-tech humidifier (rolled up paper towels inserted into plastic bowl of water) and it seems to help raise humidity in tank.
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