Advantage: Extra wide shape and soft foam padding for more comfort; dual springs provide superior buffer and shock proof performance; night reflective strip design for adding safety. User- Ergonomic Design: Wide comfortable cushion with deep central hollow design reduces pressure while offering maximum comfort. Easy Installation: Comes with wrench and rail clamp for your easy and quick installation. Thoughtful: Package comes with waterproof bike seat cover for rainy day use. Universal: Fits the common standard seat post, such as mountain bike, road bike, folding bike; perfect for both double track seat tube and clip seat tube.