Footwear trends have been shifting rapidly in recent years. An industry that was once clad with chunky sneakers and “dad shoes” is now changing course to keep up with new demands for lightweight footwear.
As brands race to develop the next lightweight design, insole materials are evolving. Among these materials, supercritical foam has emerged as a front-runner for brands looking to reduce the weight of their shoes.
In this blog, we’ll explain how supercritical foam is made and how it creates more comfortable insoles.
Supercritical foam is a type of foam created when a polymer (typically EVA or polyurethane) is combined with a supercritical fluid.
The polymer is placed in a high-pressure chamber along with a fluid such as CO2 or Nitrogen. Under specific temperature and pressure conditions, this fluid reaches its supercritical point. In this state, the fluid behaves as both a gas and a liquid.
As the supercritical fluid enters the polymer, it forms bubbles and pockets within the material. This process gives the foam the light, airy structure it is known for.
When it comes to insole materials, supercritical foam offers several unique benefits.
First, supercritical foam insoles carry excellent cushioning and energy return properties. By combining supercritical fluid with already resilient foams, supercritical foams are able to deliver exceptional rebound, making them a favorite for running, walking, and athletic shoes.
Second, supercritical foam insoles offer improved breathability and moisture management compared to traditional materials. The structure of the foam helps to circulate air freely around the underfoot, helping to regulate temperature and prevent the buildup of sweat. This feature is particularly beneficial for athletes and anyone who spends extended periods on their feet. As a result, supercritical foam is an excellent option for high-performance athletic footwear, where comfort and support are non-negotiable.
Finally, supercritical foam allows brands to build their shoes with the comfort and support they need without the extra weight. The airy structure reduces the weight and density of the foam without affecting performance.
Supercritical foam technology has transformed the design and functionality of shoe insoles, offering unmatched cushioning, support, and performance benefits. By leveraging this scientific process, footwear brands can create shoes that cater to the diverse needs of consumers across various activities and lifestyles.
At INSITE, we’re no strangers to innovation. If your brand is ready to take advantage of the next generation of insole materials, we’re here to help.
Basketball players demand a lot from their feet, and having the right insoles can make a significant difference in comfort, performance, and injury prevention. Here are some key features to look for in insoles for basketball insoles.
Recently INSITE Director of Innovation Dr. Caleb Dyer spoke at the AMI Polymers in Footwear conference in Portland, OR, delivering a presentation titled The Road to 100% Bio-Based PUs for Footwear. In his talk, Caleb focused on the obstacles and opportunities facing...
Push the boundaries of what an insole foam can do with the latest PU innovations from INSITE®, including new Levation™ ultralight PU formulas.