The fizik tundra m3 saddle the tundra is intended for xc and marathon use its shape is flat in cross sectional profile with an average width its supreme comfort and low weight are sure to take your riding performance to the next level the tundra m3rsquos kium rail makes it a lighter alternative to the m5 model whilst not compromising comfort fizik tundra m3 saddle features shell fibreglass thermoplastic composite with wing flextrade for freedom of thigh movement rail