Tundra m5 vs is made for cross country riding and racing like all fizk versus mtb saddles it combines the best of our proven saddle designs and technology and offers something new to meet some riders needs a central relief channelit has a relatively long flat narrow shape that allows for great power transfer and great support along with flexibility of movement thanks to our choice of materials and advanced hand made processes its also very lightthe tundra m5 vs s alloy features a st