Like Crocs with even thicker skin, these gaiters are made to function on extended mountaineering trips, in cold weather and difficult conditions. They are larger in circumference, giving you more room for plastic boots and insulated pants. The inside leg of each gaiter is made of durable Cordura® fabric that resists crampon snagging. Made with Gore-Tex for durable breathability. Like their namesakes, Crocs have been around forever. The instep strap is now replaceable, and an additional tab holds the front opening down, but otherwise they remain unchanged. The fitted design and durable, waterproof fabrics are as effective now as ever.