Snowline stud Spikes Chainsen Pro M red Consider the best by top mountaineers US Size: Lightweight boots 4.5-7.5 Insulated Boots 3.5-7.5 Special material for maximum durability and anti freezing up to -60 Easy to put on and no need any extra connectors or straps The burliest gauge dynamic chain link anti balling system Reduces the feet fatigue even during long periods of mountaineering