This is a pair of Magic Spikes/Spiker that are still in the packaging.
They are used by ramblers and hikers, enabling them to walk safely in the snow and ice.
Uniquely designed to fit most shoes and boots.
Simply stretch over the heel and toe of the footwear, ensuring the spike is beneath the ball of the foot. After testing however, I do not think they will stretch to more than a UK size 9.