effective and uncomplicated - the dc phase boa. a high-quality boot does not always have to cost a fortune. the dc phase boa impressively proves this. it has everything you need but foregoes pro features that are often not needed in favour of the price. the phase is a great, simple boot with a medium flex that lets you explore any terrain.outer bootthe lightweight unilite® foundation outsole is dc's lightest sole. it is made entirely of unilite material, which offers incredible durability, cushioning and padding.linerthe response liner i offers pure performance thanks to the multi-layer construction of eva memory foam. a heat-regulating fleece lining provides unparalleled comfort and the proven, classic lacing system offers reliable hold in the boot.lacing systemthe boa® coilerâ„¢ lacing system is fast, super strong and gives you the ability to adjust the boot to the millimetre. with a turntable you can tighten the upper and lower zone of the boot. the result is a secure and even fit throughout the boot, with the best support in the heel area.