Source: Slowtwitch
Published: September 14, 2025
Author: Ben Snider-McGrath
Type: Professional Sport · Independent Media · Performance Documentation
Topics: Triathlon · IRONMAN World Championship · Elite Performance · TEMPO! PRO · Aerodynamics · Performance Apparel
Athlete: Casper Stornes
Product: FUSION TEMPO! PRO Tri Suit
Performance: 7:51:39 · Course Record
Event: 2025 IRONMAN World Championship · Nice, France
Source independence: Independent Editorial
Supporting evidence: Fusion

Slowtwitch documents Casper Stornes’ victory at the 2025 IRONMAN World Championship in Nice, where the Norwegian claimed his first world title and first full-distance IRONMAN victory in a course-record time of 7:51:39.

Stornes stayed within reach of the leaders throughout the bike leg before producing a decisive 2:29:25 marathon. He caught fellow Norwegians Gustav Iden and Kristian Blummenfelt during the second half of the run before breaking clear to secure an all-Norwegian podium sweep.

Stornes raced in the FUSION TEMPO! PRO Tri Suit, developed as part of Fusion’s aerodynamic performance programme. Fusion documents the suit as being specifically optimised for high-speed aerodynamic performance, combining structured aerodynamic surfaces with cooling-focused material technology for demanding long-distance racing conditions.

The victory provides independent documentation connecting Fusion’s TEMPO! PRO development programme with a world championship performance at the highest level of long-distance triathlon.

Original source: Slowtwitch
Supporting evidence: Fusion