Phiten's Ti Compression Socks Long utilizes graduated compression design to prevent swelling and discomfort from staying on the feet for long periods of time. 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- Top band prevents the sock from sliding down- Moisture-Wicking Fabric- Structured knitting prevents ripping at the toes- Permeated with AQUA-TITANIUM® and AQUA-SILVER®- AQUA-SILVER® has an antimicrobial property that kills bacteria and odor Material: 90% Nylon10% Polyurethane Technology:AQUA-TITANIUM®AQUA-SILVER® Made in Japan