Stock Layup - 100% vertically laminated bamboo, has the best combination of durability + feel over extended periods of aggressive use. 50/50 Layup - bamboo-pawlonia hybrid core, shaves an average of ~200g per ski from Stock, and uses our full spec 2.5x2.5mm edge + corresponding base thickness. Best for those who tour <50% of their time, and want dual-purpose for touring + inbounds use. Tour Layup - bamboo-pawlonia hybrid core, shaves an average of ~400g per ski from Stock, and uses a lighter 2x2mm edge + corresponding base thickness. Best for those who tour >50% of their time, and want a dedicated tour ski.