The result is a perfect fit and maximum transmission of energy from your foot to your ski. Progressive Flex for better rebound. Carbon Steel Cuff Rear Plate and Buckles: the tempered plate positioned at the rear of the cuff stiffens the rear, increasing transmission of power when leg is flexed. The Delta Force Plus device is a special cylinder that can customise the boot flex, regardless of outside temperature. This allows you to choose from 2 different settings. Standard setting is harder flex and Extra setting is softer flex. Also features the ComfortFit liner, Canting and 35mm Velcro Strap.
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Bought these boots this year for a trip to Austria 2014. The airshell is a wee bit of a gimmick but otherwise a cracking boot as good as anything at 4 times the price. Warm, comfy, hard wearing, dry and very cheap. I will be hanging on to these for a few years to come, in fact it's very unlikely I will be replacing them , ever! Really happy with my purchase