The signature 4mm thin sole puts the minimum material between your feet and the ground

The term "bios" isn't just a label

plow through an ice pack

This boot is engineered to comply with AR 670-1 in construction and materials

Used by athletes of all levels - from Olympians to novice runners to football and basketball players

Altra Men's Superior 7 - Black/Gray Size:7.5 The signature 4mm thin soleNimble. Quick. Lightweight. If you want to feel connected to the trail, look no further. As a classic shoe in our trail running repertoire, we made thoughtful tweaks to help enhance your comfort and connection to the trail. New tongue construction and ghillie lacing system is designed for a more comfortable fit at step in, while new tooling offers increased flexibility. Its still got a MaxTrac outsole for grip, but we refined the outsole lug shape and