Burton Invader Mens Snowboard Boots Rubber Ice Spikes: Soft and grippy with stiffer spikes that dig into ice when slipping isn't an option EVA Cushioning: Lightweight and long-lasting shock absorption. Soft Flex: Thin Profile 3D Molded Tongue Adjusting the profile of the tongue's thickness controls its flex, enhances its ability to wrap the forefoot, and reduces shell/liner stack-up for improved comfort. Level 1 Molded EVA Footbed Imprint Liner: Integrated Liner Lacing, Heat-Moldable, Fit Panels, Level 1 Molded EVA Footbed