supposedly, most Lost poly boards now use Arctic foam. This foam is reportedly denser than US blanks foam and, thus, not quite as prone to heavy pressure dents. Lost boards made from Arctic foam will have the abbreviation "ARC" written with the dims ("AKU" means it was machine shaped).
one of the things that bugged me about my last lost board was they over sanded one of the (future) fin boxes. Nit picky, I know, but this made the base of one of my fins stick 1/8" up from the board.
If you get a deal online, you just gotta hope you get a good one...but if you're buying from a shop, look at the flange ridges sticking up from the boxes (the thin, raised lip hugging the fin base): they should all still be relatively thin and barely sanded down. If you see any that are inconsistent or fat, they might have been sanded down too far and the fin bases are going to protrude (pick another board).
Last edited by waterbaby; Aug 10, 2013 at 10:59 PM.