The whole entire sock is elastic with an elastic Velcro strap. Sizes XS-S/M- L and XL Up to six times more durable than Finnmark sock Width (flat dimensions)Circumference XS: 65-100 mm / 130-200 mm / 140 mm S: 70-110 mm /150-220 mm / 140 mm M: 80-110 mm / 160-230 mm / 140 mm L: 85-120 mm /170-240 mm / 150 mm XL 95-135 mm /190-270 mm / 160 mm

The whole entire sock is elastic with an Velcro strap. It becomes less elastic due to silicone dipping Size, S - M - L - XL An incredibly strong bootie for dryland Width/Circumference: S: 70 mm/150 mm/140 mm M: 80 mm/ 160 mm / 140 mm L: 85-95 mm/170-190 mm/150 mm XL: 95-105 mm/190-210 mm/160 mm