Delta Liner The delta liner offers the bare essentials in DC snowboarding boot liners. Its built of lightweight foam and has a front lacing system with reinforced lace locks so you can get your foot in the liner- and thereby get on the mountain – quickly and with less fuss. Working with memory foam the 3-D molded J bar helps provide support and a custom fit. The J bar gives some structure to the memory foam with one result…. Heel lift is eliminated.