high quality memory foam, Lycra fabric Imported SUPER SOFT & COMFORT: Sanctus bike seat cushion cover is made of upgraded high-quality memory foam materials that are beyond comfy, soft, breathable, and durable than gel or normal foam bike seat. SECURE TIGHTLY & NON-SLIP DESIGN & EASY INSTALLED: Different from others, our bike seat cover is not only with the drawstring on the back and anti-slip particles insides but also the front firm strap that more stable than ordinary drawstring or velcro cushion, which helps the customer for better adjusting to the size of the seat. The stitches are secure and the lycra fabric is fast dry material and it won't rip easily. No more slipping and sliding off your bike seat. USE FOR LARGE WIDE BIKE SEAT NOT FOR NARROW BIKE SEAT: Width of your bike seat in the range from 8.5 to 10 inches. The very soft bike seat cover is ideal for an indoor cycling exercise bike, spinning bike, cruiser bike, or outdoor cycling bike, totally pain relief. Product Size: 11.81 x 11.4 x 1.57 inches (length*width*height), 0.63lb weight. Package included 1x bike seat cushion cover and 1x waterproof cover WATERPROOF COVER PACKAGED & REFLECTIVE STRIPE: It also comes with a that protects the fabric seat. It has a nice touch fluorescent green reflector strip on the back which is perfectly visible from behind the bike. Alerting pedestrians and vehicles. Better protection for your hips. It can bring lots of convenience for bicyclists. ATTENTION: Please measure your bike seat size before purchasing and confirm if our bicycle seat meets your requirements. If you are not happy with your purchase for any reason, we will take it back! Just return through Amazon.