Columbia Sportswear Techsun Interchange III - The versatile Columbia Techsun Interchange III sandal offers lightweight stability, grip, and comfort for activities in and around the water. When you want to be able to get in and out of them quickly, flip the heel strap forward and they convert to a convenient slip-on style. Synthetic leather upper with hook-and-loop closure system. Rubber pull tabs offer easy closure. Lightweight Techlite™ cushioned footbed adds comfort. Full-length Omni-Grip™ with sticky rubber gives traction in wet conditions.