Lightweight, and according to Swiss engineers at X-Socks, particularly good for middle and long-distance runs, the updated X-Socks Run Speed Two Running Socks combine impact-absorbing and blister-defying cushioning zones at the ankle, toe, toe-tip, instep, Achilles tendon and heel with AirConditioning and AirFlow ventilation channels, plus Skin Nodor antibacterial fabric to keep you going the distance with more protected, fresher and drier feet.And because women’s feet have a different structure to men’s, their ladies X-Socks Run Speed Two Running Socks follow a ‘narrow arrow’ shape footbed, anatomically designed to put their extensive protective padding in exactly the right places. These running socks also feature self-adjusting cuffs and the X-Cross Bandage, to stabilise the sensitive, injury-prone ankle area without restricting freedom of movement.