Wear with any type shoe * Extreme Warmth, Cozy Comfort * Wicks moisture away from feet * Ladies Size Small Up to 9 Medium 9.5-11.5 Large 12+ * Men"s Size Small - Up to 8.5 Medium 9-10.5 Large 11-12 X-Large 12.5+ * Mens Size Small - Up to 8.5 Medium 9-10.5 Large 11-12 X-Large 12.5+