BOA, the world's most popular fit system, has teamed up with Massi on a brand-new Super clean RXT boot built with sailcloth, X-Pac, giving the boot lightweight flexibility, without sacrificing durability. Highlighted by the Ronix proprietary Intuition+ heat moldable liner and enclosed around the heel and toe by FlexForm, this unique material compound creates ultimate flex, comfort, and longevity. Lightweight supportive elasticity.