Mammut's lightweight back protector is ideal for any freeride skiers looking for extra protection without sacrificing movement. Constructed of multi-impact SAS-Tec foam for excellent shock absorption while remaining lightweight and highly flexible to help maintain mobility while skiing. This next level foam works by providing gentle cushioning when small levels of force are applied and maximum support when extensive force is applied meaning this back protector is made to protect you from small impacts to large impacts. Designed to fit all new Nirvana backpacks.