Ultra-wide ergonomic design The wider and larger ergonomic saddle with a contoured shape helps alleviate hip pressure during rides. A soft foam-filled cushion and a cushy PU surface provide a more comfortable experience over longer periods. Adjustable backrest pad Backrest pad adjustable from 0 to 4.72 inches with a back knob for personalized comfort. The backrest angle has been carefully studied to offer the most comfortable seating position. Sturdy and durable Constructed with a high-carbon steel frame to improve load-bearing capacity. The seat cushion uses premium plastic, polyethylene foam, and PU for long-lasting, comfortable use. Versatile replacement seat A universal replacement option for a wide, soft bike seat or a tricycle seat. Universally compatible with various bicycles, tricycles, lithium battery bikes, and lithium battery tricycles. Use scenarios - Daily commuting or long rides on bicycles or e-bikes where hip comfort and reduced pressure contribute to a more comfortable experience. - For seniors or larger riders who benefit from the wide seat and adjustable backrest for additional support during extended periods of sitting. - Replacement seating for different platforms, including bicycles, tricycles, and lithium battery bikes or tricycles, suitable for delivery riders, family use, or keeping spare seats on hand.