I had a calf muscle compartment syndrome training for a triathlon in 2017. Did not need surgery but caused a chronic swelling problem. I chronically use socks everyday and the vector 2XU is probably about 20 PSI of compression. Slowly swelling has resolved. I have never had evidence of venous disease but may have a degree of Marie Turner syndrome from prostate cancer now som 20 years ago, cheers to a successful medical solution. I skied 5 days in Lake Tahoe last week with NO symptoms. These socks can wear out but I have over 20 pairs at home and Florida home so I would say they seam to last a long time. Please do not discontinue this product and there must be others with heart conditions or venous disease where this is needed.