Rossignol Overboots provide insulation, warmth, and water-resistance to the outside of your boots. These overboots completely cover most skate boots and will cover about half of your cross-country boots.Sizing:Small: 35-37Medium: 38-40Large: 41-43XL:44-46Features Include:Made of stretchable seam-taped neoprenePolyamide fleece liningRear zipperHeel, arch, and toe straps to ensure a tight fitBest used for skate skiing and cross-country skiing