Phiten's Ti Compression Socks Long Open Toe utilizes graduated compression design to prevent swelling and discomfort from staying on the feet for long periods of time. Open Toe type allows for good ventilation and does not get musty even when worn under regular socks. Graduated compression is developed with 'higher compression fabric' on the upper calf and 'lower compression fabric' at the ankle, to gradually diminish in pressure going upwards. Style: Women's Socks Lower Compression upper calf: 16 hPaHigher Compression ankle: 30 hPa***1 hectopascal (hPa) = 100 pascal (Pa) Features:- Specially Knitted Structural Fabric - A less stretchable, mesh fabric is used to enhance support on targeted muscles and other areas while also providing superior ventilation- Moisture-Wicking Fabric and open toe design keeps moisture out- Permeated with AQUA-TITANIUM® and AQUA-SILVER®- AQUA-SILVER® has an antimicrobial property that kills bacteria and odor- Top band prevents the sock from sliding down Material: 90% Nylon10% Polyurethane Technology: AQUA-TITANIUM®AQUA-SILVER® Made in Japan