The Nago Evo is a unisex semi-round saddle that is ideal for medium to long distance, road and off road riding. It offers unbeatable versatility for riders who like a choice of riding position.The PAS system is a channel in the base of the saddle. The hole or channel helps to maximises blood flow and supports the pelvic area while also preventing pressure peaks. This system is designed and developed to eliminate pressure and numbness to areas that need it most.The Nago saddle also uses Prologo's ESD technology. ESD (Ergonomic Shape Design) is where Prologo have identified a new ergonomic design for the centre of the saddle, which allows more space for your legs and an overall better cycling position. Further to this, the ESD reduces the friction of the quadriceps against the body of the saddle.The saddle also has Active Density Technology which combines 3 foam densities with a variable stiffness base. It's structured in different areas using 3 related foam densities. **High Density** - This is on the rear of the saddle and it gives a stable support of the ischial bones.**Medium Density** - This is in the middle of the saddle and it reduces the pressure on the pelvic area.**Low Density** - This is at the front of the saddle and it reduces pressure peaks in the body.**Specs*** Size: 278x134mm* Rail: TiroX Alloy 7mm* Cover: Microfibre* Padding: Light Foam* Weight: 205g