Salomon Mission X4 Ski Boots for Sale. 26 Mondopoint or men’s size 8. Very nice recreational boots with a 55 flex and 3D Sensifit (a softer plastic on the top, which helps wrap the foot more comfortably). Used, but in good condition. Below is info from the manufacture… The mission series is designed for the recreational skier looking for maximum comfort with a little bit of performance. Simple, comfortable and easy going is the name of the game. With a 55 flex the Mission X4 is soft enough to be driven and controlled by all ability levels. Salomon uses the Fusion Comfort liner, which is based around comfort and warmth to help the entry level skier stay out on the hill all day. Micro adjustable buckles at the lower cuff and over the instep allow for some customization for foot shape and tool free catches on the upper cuff let the Mission 4 adapt for different leg shapes.