2-pk of M&B Trimmable Polar Felt Insoles. This insulating cold-weather insole is made up of 2 layers. A felt layer traps heat and cushions the foot. At the base of the insole is a woven layer of felt and aluminum that prevents heat loss and guards against dampness. Protects against temperatures of down to -25’C. Great for work boots and rain boots. Includes trim card in package. MADE IN CANADA. How to wear: Insert the insoles grey/silver side down. Your foot rests on the white side.Trimmable sizing covers MEN’S SIZE: 7-13 & WOMEN’S SIZE: 6-11.