The Phantom 6000 is designed for high-altitude alpine climbing and technical mountaineering. Its double-layered construction with a PrimaLoft-lined inner boot provides excellent warmth, insulation, and fit. Compatible with step-in crampons. Features OutDry technology. Used for two seasons in the snow, then stored unused. Still in good condition. Size: EU42. Fits my actual foot size of 26.5cm perfectly.