WEAVING STYLE & QUALITY INTO THERAPEUTIC THREADS. Made with moisture-wick nylon and 400-needle count for flexibility and comfort. These socks offer firm compression (30-40 mmHg). 30-40 mmHg is a prescription compression level and is often prescribed by a doctor for treating health conditions such as venous insufficiency, deep vein thrombosis (DVT) and lymphedema. Please consult with your healthcare provider before choosing this level of support. This design also comes in a lower compression levels of 15-20 mmHg and 20-30 mmHg. Our stylish compression socks help energize legs, reduce swelling, alleviate achiness and heaviness, and aid in muscle recovery. Perfect for travel, nurses, runners, pregnant women, teachers, hair stylists, retail workers or those who sit or stand for long periods.