IOMI - 2 Pack Womens Knee High 40 Den Graduated Compression Energizing Socks 88% Nylon 12% Elastane Machine Washable IOMI Footnurse Energizing Socks incorporate graduated compression technology in order to help support and promote healthy circulation so that aching, fatigued and tired legs are re-energised. IOMI's graduated compression is greater at the ankle, gradually reducing further up the leg to support muscles and help circulation. IOMI Energising Socks possess a factor 10 ( 10mmHg ) graduated compression rating, the ankle circumference being 24cm (approved by British Standard BS6612:1985). A Soft Touch and Comfortable Toe Seam is also combined into IOMI's design for all day comfort. They are also Knee High so that the effect of graduated compression can be maximized across the whole leg. As well as being used to rejuvenate fatigued legs IOMI's energizing socks can also help relieve swollen feet and ankles.