- Maximum weight capacity: This bicycle seat with backrest features an ultra large seat and a weight capacity over 300 lbs, delivering a stable and safe ride. - Ventilated holes: The backrest design includes ventilated holes for airflow, helping you stay cool on long rides and keeping the seat in proper position while riding. - Adjustable backrest: Height adjustable backrest provides ergonomic support for the lower back. The backrest can be adjusted up to 4.5 inches to fit your preference and posture. - Waterproof performance: Reusable PU leather and high density memory foam padding offer tear resistance and waterproof protection, ensuring durability and longevity. Use scenarios: - Family rides or daily commutes on a standard bicycle, where a rear passenger needs stable support and adjustable comfort. - Long distance or scenic rides that require back support and breathable seating for extended periods. - Rides in variable weather conditions, where waterproof and durable materials help protect the seat and maintain comfort.