PROMEND SD-577 Bicycle Honeycomb Bionic Structure Saddle Hollow Steel Bow Breathable Comfort Saddle, Size: M(Black Surface Colorful Shell Bottom)1. The middle frame is colored by vacuum plating process, bright and brilliant, personalized gradient 2. Hollow and breathable design reduces compression, reduces weight and does not accumulate heat, enjoy a smooth ride 3. Bionic honeycomb design, dynamic zoning support, comfortable sitting feeling, easier to force 4. Covered with thickened EPU rubber material, one piece molding, flexible, soft and elastic, not tired of sitting for a long time 5. The