RECOMMENDED FOR: All day/everyday wear, flying and travel, prolonged sitting or standing, exercise, recovery, and pregnant women. Ideal for those who work in professions that demand prolonged standing: nursing, healthcare, retail, or even construction 4 ZONES OF FIRM (20-30 mmHg) GRADUATED COMPRESSION: helps to minimize swelling, reduce fatigue, stabilize muscles, and provide plantar fasciitis relief. Energizes legs and feet. COMFORT & PERFORMANCE FEATURES: Full arch support, reinforced toe & heel, ultra light cushion sole, non-abrasive seamless toe closure. HIGH PERFORMANCE YARNS: Provides natural moisture management, odor control and thermoregulation. SIZES: Small/Medium fits women's US shoe size 4 – 7.5, Size Medium/Large fits US shoe size 8 – 11. Sock length fits over the calf. Size Medium/Large fits men's US shoe size 7-10, Size Large/X-Large fits US shoe size 10.5-13. Sock length fits over the calf.