Oversized Seat with Backrest Bluewind new version oversized bike seat with backrest is 2X larger than traditional seats. Bike seat size: 33x29x9cm, 6cm thick foam is soft but not collapsing, providing better support for the hips. Adjustable Backrest The backrest allows you to adjust it up and down by 10 to meet your different needs and achieve the most comfortable and tail support. Bluewind intends to give you the most comfortable and best riding experience ever. Durable Leather Surface Quality microfiber artificial surface leather, wear-resistant & non-slip. The bicycle seats exquisite seamless edging design make it resistant to daily rain.