ISM is the most commonly used saddle at the Ironman World Championships.
In the annual gear count at the Ironman World Championships, the ISM saddle was again counted as the most used saddle: of the 1494, 828 were ISM saddles. Against number two 359 pieces and number three 307 pieces. So more ISM than number two and three together!
The saddles on this page are classified by relevance, which makes the choice a bit easier. Otherwise click on “saddle selection aid” for more info.