Waveless Wall Foam Roll #3 Density. See and feel the high quality of our excellent, 3lb true density flat wall foam. Easier installation and superior protection of pool liners in metal, concrete or wood wall pools. True density foam produces smooth walls. All coreless rolls are protected with heavy gauge stretch wrap. This is an absolute must have for every above ground pool. Roll size: 1/8"X42"X125' with 3lb Density.