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Definitive Fit System™
Admittedly we've made a few improvements over the years
The flexible 4-way stretch fabric is equipped with PrimaLoft® and Hippora®
Not to be mistaken as "just another leash"
This iteration also incorporates a wide fit design to accommodate the needs of those with wider feet
Sidas Trail Ultra Running Socks Size:40-41 Definitive Fit System™Muscle fatigue causes the foot to collapse and lengthen, and the metas to widen. We have taken these phenomena into account when designing this new range of socks with the athletes of Team Sidas Matryx. Thanks to the Ultra Fit technology, the Trail Ultra socks act like an exoskeleton to compensate for the consequences of muscular fatigue of the foot during an ultra trail. The Trail Ultra sock includes all the features of the perfect ultra trail sock:
