The secret to making great winter boots is spelled EVA. Not rubber, not PU, not PVC.
EVA (Ethylene Vinyl Acetate) appears in a lot of different shoes, especially high-performance sports/running shoes. Thanks to many of its unique characteristics, the material has proven to be a fantastic choice for making both midsoles, bottom soles, and uppers. Below, we’ve listed the top features that make EVA a fantastic material to work with when it comes to making state of the art winter boots.
- Incredible adaptability – EVA foam can be made stiff or flexible, which makes it exceedingly easy to customize.
- Amazing cold resistance - The insulation abilities of EVA (heat and thermal) makes it perfect for polar equipment.
- Fantastic stress-crack resistance – Related to its flexibility.
- Great ozone and UVA radiation resistance – This means EVA foam can take pretty much whatever the environment throws its way.
- Astounding chemical resistance – The structure of EVA makes it highly resistant to dilute acids, dilute alkalis, oils and greases, aliphatic hydrocarbons and alcohols.
- Superior impact and vibration absorption - EVA materials consist of thousands of tiny bubbles joined together that hold air. When compressed, these bubbles provide cushioning and shock absorption, making EVA an ideal material for footwear soles of different kinds.
- Excellent water repellent abilities - 100% moisture and water proof.
- Very low density - The low density of EVA makes the material amazingly light. Much lighter than Polyurethane (PU)/natural rubber.
- Totally safe - Highly graded EVA doesn’t contain any harmful chemicals whatsoever. As opposed to much of the outdoor apparel we use, it’s 100% PFC free.
These days, we’re closely monitoring the research around bio-based EVA-like materials. Our ambition is to be among the first companies in the world to release a 100% bio-based "EVA" winter boot.