Sigvaris 863 Select Comfort Compression Socks for Women have a compression strength of 30-40mmHg. Always check with your physician or therapist before beginning any compression therapy. 30-40mmHg compression is often recommended for moderate to severe varicosities with mild edema, primary venous ulcer treatment, and primary venous ulcers. Often prescribed for pregnant women with moderate to severe varicose veins. Made with highly-elastic, two-way knit fabric, these compression stockings are comfortable and durable enough for every day wear. Available in four opaque colors. Sold standard with a smooth, soft top band or select the optional silicone "grip-top" band available in Crispa and Black. One pair.