The 424 NNN XC boot. A lightweight molded EVA out sole, composite fiber mid sole and a thick 4mm insole provides all day comfort, warmth & traction. The upper is constructed from a durable laminated waterproof synthetic. The lining is soft velour with thick foam padding for insulation and comfort. Bellows tongue. The heel counter is balanced with lateral foam pads to prevent heel lift. A great choice for begginer to intermediate skiers.