Superfeet Green provide maximum support and shock absorption throughout the entire stride of the foot for better balance, less muscle fatigue, more endurance, and more efficient motion. Ideal for feet with medium to high arches and for footwear with removable footbeds. Top made from lightweight pre compressed foam for comfort and durable performance. Extra deep heel cup for maximum shock absorption. Anatomically correct arch shape for comfortable support. Friction control top cover for fewer blisters and hotspots. Extra cushion at arch for comfort and shock absorption. Durable and lightweight external polypropylene support cap. 34 length support cap along the bottom provides optimum control and flexibility. Unique design provides independent metatarsal support for added flexibility. Agion antimicrobial top cover treatment to reduce bacteria and help prevent foot odor. Ideal for feet with medium to high arches. Designed primarily for footwear with removable insoles: running, walking, hiking, and alpine. Men's U.S. shoe sizes: C 5.5 7 D 7.5 9 E 9.5 11 F 11.5 13 G 13.5 15. Women's U.S. shoe sizes: B 4.5 6 C 6.5 8 D 8.5 10 E 10.5 12.