Ergomorphic™ Footbed: An anatomically shaped removable footbed with a layer of Ergomorphic™ foam that customizes to the shape of the wearer’s foot after approximately 12 hours of use.

Sol Farm™ Footbed made with Sol Farm™ 14, a polyurethane compound that utilizes 14% natural oil polymers (e.g. oils derived from seeds).

Super Structure Cord: One piece cord made of climbing-grade rope, with a tensile strength of 106kg, which spirals around the sculpted Shell, resulting in the wearer's ability to customize a precise fit based on the demands of their activity.

IMEVA Upper Shell: Super Structure Design results in 97% material efficiency via our pellet to parts manufacturing process. The IMEVA upper has a deep heel cup for comfort and security and features ventilation holes for enhanced breathability.

Wet/Dry Traction: Ultimate traction on wet and dry surfaces with a unique outsole design that features a proprietary Quad-Cut™ siping and Gripstick™ rubber compound made with Round 2 Rubber™ (R2R) material that has a 15% recycled rubber content.

Ultra-lite: Designed to be feather light whether it's wet or dry.

100% Water Compatible: The Pen Shell sandal does not get wet like leather or fabric footwear. It is hydrophobic, meaning it does not absorb water.