Review on 🏊 Sunlite Sports Swimming Kickboard, Pool Exercise Float and Training Aid - EVA Material Swim Buoy for Boogie Board Workout, Available in Multiple Sizes for Adults and Children by Rick Bishop

They're a bit shorter than what you can find in Local Y, but they're thick enough and not thin. The only problem is how they are packaged - a piece of hard cardboard or something similar might help. The green one has a slight dent on the side and a bit of warping - not too bad. Black has good warp, enough to be noticed. I'll put something flat and heavy on top and leave it in the sun to see if that helps. Not the worst I've encountered sailing, but you can end up with a warped board - hopefully no worse than mine.