phase boa snowboard boots. a high-quality boot doesn't always have to cost a fortune. the dc phase boa impressively proves this point. it has everything you need but foregoes pro features in favour of price. the phase is a great, straightforward boot with a medium flex that lets you explore any terrain.outer bootthe uniliteâ„¢ foundation outsole is dc's lightest sole. it is made entirely of unilite material, which offers incredible durability, cushioning, and padding.inner bootthe response liner i offers pure performance at a low weight, thanks to its multi-layer construction of eva memory foam. a thermoregulating fleece lining provides unparalleled comfort, and the proven classic lacing system ensures reliable support in the boot.lacingthe dc single boa system with h4 coiler provides a micro-adjustable fit, quick and easy adjustments, high durability, and additional support through an internal ankle harness.