Ethylene Vinyl Acetate, which is a foam-like material used in, among other things, sports shoes and many items of clothing and sports equipment. It provides an optimum balance between flexibility and durability.

MaxTrac™ is an outsole developed by Altra that combines grip, traction and durability to provide a confident stride on a variety of surfaces. It allows runners to move comfortably and steadily on demanding trails.

GaiterTrap™ is an Altra-branded system that makes it easy to attach stilettoes to trail shoes. A special Velcro fastener located on the heel eliminates the need for straps under the sole, effectively protecting feet from sand, mud and stones. This solution also allows for a convenient change of shoes or socks without removing the stuput, increasing comfort on the trail.