Here's what other sites are saying:
Ideal for travelers and people who are on their feet all day, the SmartWool Women's StandUP Compression Socks improve blood flow and minimize swelling caused by lower-leg fatigue. SmartWool added a touch of stretchy Elastane to the merino-and-nylon blend fabric so these socks are truly buttery-smooth and comfy.
The SmartWool StandUP Sock is the fashionable traveler's best friend. Constructed to provide a mild amount of compression, the StandUP Sock helps sooth and minimize ankle, calf and foot swelling so long days flying or pounding the pavement feel good. Graduated compression minimizes leg, ankle, and foot swelling, reduces fatigue, and speeds recovery 15-20 mmHg graduated compression rating Buried toe closure Sizing: Small: Women's 4-6.5; Medium: Women's 7-9.5; Large: Women's 10-12.5
Smartwool Women's StandUP Sock DECENT FEATURES of the Smartwool Women's StandUP Sock Graduated compression minimizes leg, ankle and foot swelling, reduces fatigue and speeds recovery 15-20 mm Hg graduated compression rating Buried toe closure The SPECS Height: Knee high Cushioning: Micro cushion Fabric: 65% Merino Wool, 32% Nylon, 3% Elastane