Know Your Shoe

A-Bound™

Environmentally friendly, this energy-return compound is made of recycled materials. Offering extra protection, this unique layer sits directly under the foot to return energy back into each stride. It reduces the impact of hard surfaces while still maintaining ground feedback. Traditional running shoe foam compresses 70-90% while A-Bound™ compresses 2-3x less so it won't deform over time.

'A'-Wrap

Wrapping the midfoot, this innovative design offers a snug fit for necessary control. Customers will experience a natural, roomy toe environment and a better, more comfortable run.

SeeNoSeam™

Found in select Altra shoes, this comfortable, advanced stitching allows the foot to rest against a smooth surface with no seams.

StoneGuard™

Sandwiched near the foot, between the A-Bound™ and the midsole, the StoneGuard™offers flexible protection. This multi-sectional layer deflects rocks into the midsole for a smoother, more stable ride.

NRS - Natural Ride System™

This unique combination of outsole and midsole componentry with proper metatarsal parabola, Zero Drop™ platform and foot-shaped lasts allows people to run as nature intended.

Asymmetric Lacing

Following the volume heights of the foot, this lacing system improves the fit and natural flex zones in the shoe for a better fit and fewer pressure points.

HeelClaw™

Fitting snuggly around the calcaneus, this unique design offers a more comfortable fit without the traditional, stiff heel counter found in other performance shoes.

TrailRudder™

Stay in control on any steep descent with this throwback feature. It's a graceful nod to the very first trail running shoes.

Insoles and Outsoles

BareSole™

Maximize proprioception with this minimalist sole. Crafted from siped performance rubber, this thin sole layer measures 3.4 mm.

TrailClaw™ Outsole

This outsole positions the strongest canted lug traction directly beneath the met heads with follow up 'claws' positioned near the front of the shoe. The combination of the unique uphill and downhill traction in combination with sticky rubber makes the TrailClaw™ Outsole a beast in any trail condition.

FootPod™ Outsole

For maximum flex and responsiveness, this outsole maps the bones and tendons of the human foot. With canted lugs mapping your foot, this unique outsole provides a natural, all-purpose traction system for a variety of surfaces from road to treadmill to dirt paths.