Mizuno Lady BG Arch Support Running Socks (3 Pack) Arch Support Structure - This is a special diamond pattern that wraps around the arch like a hammock and supports it. Toe Comfort Zone - Fine knit with superb elasticity mitigates tight-fitting feel in the toes. Instep Protection - Textured knit with outstanding cushioning property reduces impact to the instep. Breathability - Open textured knit allows moisture to evaporate, keeping your feet cool and ry.