Powerful skiers who demand energy and control will feel at home in the Fischer RC4 PRO MV Boa ZipFit Boot. These boots boast a high-performance combination of a super-stiff 140 flex, precisely fitting ZipFit liner, and a new BOA H+i1 Retention System. This BOA Retention System allows you to make micro-adjustments to the feeling in your forefoot to avoid discomfort and promote precision.