Servus Anti-Slip Undershoe Tungsten Carbide Studs (SR101) Adds grip and traction to your work shoes and boots; pliable in cold weather Tough tungsten carbide studs bite and grip slippery ice and can be replaced as they wear out Undershoe stays flexible for easy stretching and fitting over your existing footwear even in cold weather, acting as a second sole Compact design easily stores in a pocket, work belt or glove compartment until you need it Recommended use: work or play in the snow and ice