Key Features Earth-Link™ Grounding Tech Disclaimer Limited Grounding Technology: Our Earth-Link technology is designed to create a connection between the wearer and the earth through innovative materials and design. Anti-Debris Knit Collar Removable AdaptSol™ Insole Non-Marking Trinity Tread Foam Midsole Supportive Overlays Zero-Drop Sole Wide Toe-Box Flexible Traction Highly Breathable Machine Washable Still have the box. I wore these out for one run and realized they were a little too short for my feet :( Loved the wide toe box and zero drop. The lugs were also great out on the trails. I need an 8.5. I typically wear a 8-8.5. So I would say these fit a little smaller than usual. Some mud spots from that run, but otherwise like new condition.