The Fischer Twin Skin Superlight EF Ski is an all-around, classic cross-country ski with Twin Skin strips integrated for a solid balance of grip and glide Fischer built this ski remarkably light for integrated skins, and the Air Core Basalite core has a thin, powerful layer that makes up the stiffness. Efficient Forward technology shapes the composition underfoot to flex more at the toe for a greater kick action that smooths out turns for beginner and advanced skiers alike.