Made with high-quality fabrics and 400-needle count for flexibility and comfort. Our socks offer firm compression (30-40 mmHg) and are commonly used for moderate edema, lymphedema, Deep Vein Thrombosis (DVT), preventing blood clots, and other medical conditions. This design also comes in lower compression levels of 15-20 mmHg and 20-30 mmHg. 30-40 mmHg is considered medical-grade compression and should be recommended or prescribed by your doctor. FSA/HSA eligible.