Norda and Envalior have presented the norda 055, the latest version of a trail running shoe using midsole technology based on Arnitel thermoplastic copolyester elastomer. The new model builds on the solutions previously used in the award-winning norda 005, but it was designed for different applications, primarily ultra long-distance racing and movement across difficult technical terrain. According to the manufacturers, the thicker Arnitel midsole is intended to provide a higher level of cushioning and energy return while maintaining the low weight, durability, stability, and mechanical resilience expected by advanced trail runners. An example of the model’s use in race conditions was the Cocodona 250 in Arizona, where ultra runner Rachel Entrekin won in a record time, covering the full 250-mile distance in the 055.
The 055 shows that Arnitel foam technology can be used in different trail footwear segments. While the norda 005 was designed as the lightest and fastest trail racing shoe possible, the norda 055 expands this performance platform by using a thicker midsole intended to provide greater cushioning and protection during prolonged effort on uneven terrain. The release also emphasized that the material is intended to maintain performance properties across changing temperatures and varying trail conditions.
Andre Oosterlaken, market development manager for Arnitel at Envalior, said: "Arnitel continues to redefine what trail runners can expect from high-performance midsoles. Working with brands like Norda, which do not settle for anything less than perfection, keeps pushing us to continue developing next-generation midsole foams to meet and exceed their expectations."
Material properties and design assumptions
Compared with conventional lightweight, high-rebound foams, Arnitel is said by Envalior to provide better retention of mechanical properties, more stable performance across different temperatures and trail conditions, and long-lasting resilience. The company also points to low energy loss after the foaming process, which is intended to allow the midsole to maintain responsiveness and comfort over extended distances and in demanding use environments.
Norda co-founder Nick Martire explained: "Each one of our shoes is a specific tool for a specific purpose, and with the 055, we set out to create an all-mountain shoe that is explosive, yet stable. Arnitel’s unique mechanical properties made it the only foam that could strike the right balance between rebound, stability, and durability required for the 055’s intended use cases."
The launch of the norda 055 also coincides with the introduction by Envalior of a new generation of Arnitel foaming grades. These materials are intended to improve foam performance and expand processing capabilities in footwear applications. According to the company, the new solutions are to support the further development of lightweight, durable, and high-performance footwear.
The norda 055 trail running shoe features an Arnitel midsole designed for lasting responsiveness, comfort, and energy return across changing temperatures and challenging trail conditions
