Safety first

Optical heart rate sensors work best when they're held securely against the skin

Birkibuc® synthetic upper

85140-SMDB

Lightweight yet Strong 100% Recycled Fabric

Altra Men's Superior 7 Black/Gray Size:8.5 D Width Safety firstAL0A85Q7020 Nimble. 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 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