Bike trainers are notoriously loud. Fan trainers are the loudest types of trainer by far, though even the quietest type, fluid, still make some noise in vibrations of the internal mechanism. Training mats are put underneath the trainer unit to dampen the vibrations that go into the floor and so reduce the noise they make, making it more bearable for roommates or neighbors as you train. Trainer mats are also useful as they keep provide a flat and stable place for your trainer so they are less likely to fall over even if you are sprinting or moving around on the bike a lot. Features: - Protects your floor from sweat and bike grime - Keeps your trainer from walking during intense workouts - Durable construction absorbs vibration and noise