FITS MOST BIKES – Compatible with standard seat post clamps. SOFT & SAFE MATERIALS – High-quality foam for comfort, non-toxic and CPSC-tested. KID-FRIENDLY DESIGN – Ergonomic shape protects young riders and ensures enjoyable rides. EASY TO INSTALL – Comes with mount, quick and hassle-free. 100% refund or replacement if needed. SIZE: 8.7x7.5 INCH – Fits 12-20 inch girls' & boys' bicycles. SHOCK ABSORPTION & WATERPROOF – Multi-partition support, bottom spring design, and waterproof material for added comfort. HUMANIZED DESIGN – U-shaped cushion and curved area for stable sitting. Slip it on and enjoy your bike ride. AFFORDABLE PREMIUM QUALITY – Accessible pricing with a promise of great cycling experience.