1.ULTRA-WIDE ERGONOMIC DESIGN: The wider and larger ergonomic saddle with contoured design helps alleviate pressure on the hips during riding. Combined with the soft foam-filled saddle and cushy PU surface, it ensures a more comfortable ride. 2.ADJUSTABLE BACKREST PAD: Adjust the backrest pad within a range of 0-4.72 inches using the knob on the back for personalized comfort. The backrest angle is meticulously researched to the most comfortable experience. 3.STURDY AND DURABLE: Made from high-carbon steel, the frame enhances load-bearing capacity, while the seat cushion is constructed from premium plastic, polyethylene foam, and PU for a long-lasting, comfortable sitting experience. 4.VERSATILE REPLACEMENT SEAT: Whether you need a replacement for a tricycle seat or another wide, soft bike seat, this seat is universally compatible with various bicycles, tricycles, lithium battery bikes, and lithium battery tricycles.