The Bioaktive Trekking range is for people who enjoy their free time cycling. The perfect saddles for the lovers of trekking or simply for riding on city roads in freedom. The biodynamic structure guarantees reduced weight and lasting greater resistance. If you prefer the longer routes, the more compact padding of the \"small\" saddle will provide the best comfort. The large is better suited for shorted more leisurely rides.Features:Rail: Steel/CarbonShell: PolypropylenePadding: BiofoamCover: Black Matt SilkfeelSize: Small 175mmSize: Large 188mmWeight: 405g / 440gBiofoam:A light weight memory foam with great resilience. Biofoam’s structure is accommodating with the movements of the pelvis during pedalling. It reduces saddle weight and guarantees comfort and durability. The “closed cell” surface also ensures the saddle will repel water.Bioaktive is a successful line of saddles anatomically designed to suit every style of riding. It benefits of the elaborate experience and heritage of Selle San Marco, an Italian company. That produces handmade bicycle saddles since 1935. Premium materials, high technology. Solutions and dedicated features make each Bioaktive saddles unique. The need to simplify. The choice for the perfect saddle resulted in a range designed according to riding style:Sportive, trekking or city.Which kind of rider are you?If you prefer short trips or you ride every now and then choose a LARGE saddle, it will ensure the comfort you need. Otherwise, if you ride for longer routes or you use your bike frequently you should find the right saddle on the section “SMALL”.