Bamboo Charcoal Fibre has the advantage of absorbing toxins through the soles of your feet. In a similar way charcoal absorbs toxins when administered as an oral poisoning antidote. Its loosely fitting top is totally non-restrictive to circulation and is therefore suitable for diabetics or people with circulation problems. The bamboo charcoal fibre is restricted to the grey sole section of the sock only. Composition: 46% bamboo/20% bamboo charcoal fibre/28% cotton/6% elastane.