For cross country skiers, the melting of the snow each Spring is a bit of a sad milestone, marking the end of the Nordic season. Sure, there’s biking and hiking to look forward to, but there is just no warm weather alternative to skiing—or is there?

As cross country skiing was coming into its own as a competitive sport in 1950’s Scandinavia, athletes realized that to maintain peak performance, a way to train during the snowless off-season was necessary. So, the roller ski was invented.