From the blog:

Features

• Cleansport NXT™ for natural odor control
• 4mm multi directional lugs
• Contoured heel lock
• KEEN.Dry waterproof breathable membrane
• Torsion stability ESS shank
• Waterproof nubuck leather upper

Material

• Waterproof nubuck leather upper
• Non-marking rubber outsole
• Dual density compression molded EVA midsole
• Hydrophobic mesh lining
• Removable metatomical dual density EVA footbed

Technologies

• KEEN.DRY: A proprietary waterproof, breathable membrane that lets vapor out without letting water in.
• Metatomical Footbed Design: This internal support mechanism is anatomically engineered to provide excellent arch support and cradle the natural contours of the foot.