SERFAS Tailbones TBM-20 Memory Foam Saddle - UnisexSerfas Tailbones saddles supports the sit bones and provides a smooth comfortable ride using Progressive Density Foam while a Deep Groove Design allows maximum blood flow into the neurovascular bundle for drastically reduced numbness and discomfort. The Tailbones family introduces a top layer of Memory Foam for a more personalized feel as well as added comfort. 90 Day Comfort Guarantee Finding the perfect saddle can be tough, which is why every Serfas