If a slipper had a baby with a high performance race boot, that baby would probably look a lot like the Atomic Aina Women's Skate boot. Comfortable enough to wear all day, with enough backbone to give you a burst of speed if you're looking for it, the Aina has a moderately roomy 104mm SportFit last, built on a stiff Skating Flex outsole that transfers energy efficiently from your foot to your ski without requiring World Cup level power input. It also provides extraordinary ski control, with a dual axle SNS Pilot bootbinding interface that snaps your ski back to your foot after each kick, and a full length guide ridge for stability on downhills. If you plan on cruising the trails all day, you'll be singing the praises of the Aina's Forefit Quicklace system, which provides a snug fit with the pull of a tab, eliminating pressure points and making adjustments a snap. To prevent the back of your foot from lifting, Atomic built in an anatomical heel counter and adjustable heel strap, providing precise, adjustable heel hold that's solid if you need a quick turn of speed and comfortable if you're planning on a long tour, and provided a heel foam liner to for cushioning. Thinsulate insulation and a zippered lace cover work to keep out cold and water, letting you go all day without giving your feet a second thought.