Fizik tundra m3 kium mtb saddlethe tundra is 1 of fi'zik's 3 spine concept mtb saddle shapes. Of these 3, the tundra shape is flat, narrow and long.the m3's carbon braided rail reduce weight and increase saddle stiffness.tundra m3 is for the snake flexible spineif you are very spinally flexible far less than 90 degrees between your straight legs and your back when bending over as far as you can, keeping your legs straight a shoulders' width apart, you are a snake. You achieve the performance position using your spinal flexibility alone, not rotating your pelvis at all.you will like the flat, narrow and long shape of the tundra.featuresshell fiberglass thermoplastic composite with wing flex for freedom of thigh movementrail kiumfront cover orange microtexcentral cover black microtexrear cover white microtexintegrated clip system yeslength 285mmwidth 125mmweight 200gbuy fizik components from chain reaction cycles, the world's largest online bike store.