Active Effect® WOOL KNEE HIGHS FOR HIM FOR HER 13/17 mmHg. The new ACTIVE EFFECT® Wool knee-highs with graduated compression ensure an effective preventive action and a relaxing massage all day long, as well as excellent wearability. Pointed out for those who show the first circulation problems, they are ideal for the autumn and winter season. In fact, wool is a fibre with thermoregulatory properties which avoid outside cold to come into contact with the body. Moreover, they prevent bad smells and wear due to rubbing inside the shoes. Find out more about available sizes and colours in the ACTIVE EFFECT line.