- UNIVERSAL FIT & SIMPLE INSTALLATION: This backrest seat is compatible with standard 7/8 inch seat posts, making it ideal for a variety of bike types, including adult tricycles, bicycles, and stationary exercise bikes. Easily upgrade your ride with no complicated setup. - ERGONOMIC COMFORT: Designed for optimal comfort, this bike seat features an ergonomic shape that promotes better posture and provides essential back support. The widened thick cotton padding enhances breathability and alleviates pressure, ensuring a more enjoyable cycling experience. - DURABLE & HIGHLY ELASTIC: Constructed from premium iron, a robust plastic clamp holder, and highly elastic polyurethane cotton, this backrest saddle is built to last. It offers outstanding durability, flexibility, and resilience, ensuring consistent performance on every ride. - VERSATILE CYCLING ACCESSORY: More than just a replacement saddle, this soft bike seat with backrest is a thoughtful gift for cycling enthusiasts and their families. Enhance your cycling adventures with this comfortable and reliable saddle. Use Scenarios: 1. Perfect for leisurely rides on adult tricycles, allowing for a relaxed and supportive seating position. 2. Ideal for stationary exercise bikes at home, making workouts more comfortable and encouraging longer sessions. 3. A great option for casual biking trips with family, ensuring everyone enjoys a pleasant ride without discomfort.