Selle Italia SLR Boost Gravel Superflow Saddle - Titanium Black L3. The SLR Boost Gravel Superflow saddle surpasses the most advanced frontiers of lightness and durability and is the new must-have for gravel riders who refuse to compromise on performance and comfort. Highlights include lightweight but strong TI 316 rails “Superflow” cut-out to relieve perineal pressure light gel padding for all-day vibration dampening and a tough Fibra-Tek cover in black with high-visibility reflective inserts.