Check the listing for details. Prologo Proxim Altius E-Bike & E-MTB Saddle with Steel Rails, Active Base Tech. Condition: New. Listed at 84.23 USD. SADDLE PROLOGO PROXIM ALTIUS STL 150 BKAltius, the new saddle from the Proxim line designed for use on e-bikes and e-MTBs, is ideal for those who want to pedal comfortably and safely, even without the assistance of the electric motor. Active Base System technology includes an opening in the saddle base covered by a thin layer of padding, resulting in a wide and soft support surface that allows pressure relief while providing effective protection against water and mud. V-shaped saddle with a semi-round ergonomic shape stands out for its wide, generous, and flat nose, which allows effective and comfortable pedaling both uphill and downhill. Features a rear rise that is designed to ensure a stable position and prevent the rider from sliding backward during more intense pedalling. Recycled.