Trem resistant material: Made of reusable high density PU and memory foam pads, this backrest bike seat promotes a comfortable, ergonomic ride. Improved cycling experience: Our bike seat and backrest enhance your cycling experience. Advanced shock-absorbing memory foam ensures maximum comfort, while powerful damping force eliminates vibration on any road surface. Extra Seat: This bike seat with a backrest is designed to support your waist and make it even more comfortable while riding. The seat dimensions after assembly are 12.99 11.8 (length width) inches, with a maximum load capacity of over 300 pounds. Breathable holes: A bicycle seat with a backrest keeps you in the correct position while riding. The thoughtful hole design ensures good airflow, keeping you cool and comfortable even on long rides. Use scenarios: - Daily commuting or long leisure rides where back support improves posture and reduces fatigue. - Long-distance touring or multi-hour rides where memory foam cushioning absorbs shocks for comfort. - Riding on rough roads or gravel where damping reduces vibration and enhances stability.