Superstrong - no stretch, no sag and breakage! The unique highly durable product is made by combining two extremely strong raw materials. The tech involves reinforcing high quality red buffalo leather with a layer of practically indestructible Biothane. The highly tough red buffalo leather is armoured with waterproof, stretch resistant and supple Biothane which makes the stirrup leather almost entirely resistant to horse sweat & riders weight pressure therefore no stretch, sag or breakage!