Evaporative Cooling is the body’s most effective way to cool down. So if you need something to help keep cool in hot temperatures then these PermaCool Socks are the best possible option.The NEW Scientifically Tested Technology boosts evaporation which keeps your feet drier and cooler than a conventional sock. These socks contain certain properties to help keep moisture away...First is the Channelled Fibres which quickly move moisture away at 1500X magnification from the body 4X more than a basic cotton sock. The knitting on these socks have a great airflow which increases air permeability 5X more than a basic cotton sock. And finally they have Low Absorption Fibres which reduces moisture retention, increasing the fibres ability to transfer it 2X more than a basic cotton sock. These socks are made from 92% Polyester and 8% Nylon, with 4 sizes available which include - 3-5 ½, 6-8 ½, 9-11 & 11-14 UK and come in 4 different colours which include - Black, White, Pink/Purple and Black/Navy/Charcoal.