Very lightweight, water-repelling insulation material for additional thermal protection in the forefoot and toe area. Triple F Membrane Special membrane ensures that conditions inside the boot are perfect: dry, warm and breathable. Waterproof For full protection in all weathers. The "Triple-F" membrane keeps the body warm and dry and ensures that the garment is pleasant to wear. The material repels moisture, even in extremely harsh conditions while fully sealed seams make sure that no moisture can penetrate. Fischer Urban Sport Snow Boots