The Petzl Irvis Front+Back anti-snow system is an essential accessory for crampons. It features an innovative design that minimizes the build-up of snow, regardless of the snow quality. Made from a durable, dual-density polymer, these anti-balling plates are extremely effective and flexible. With every purchase you get two anti-balling plates, enough to equip a pair of crampons for safe footing on winter tours.