Crocs Classic Evo Gum Clog A utilitarian take on the Classic Clog. The Classic Evo Gum Clog showcases a gum colored, grippy rubber outsole with a matching translucent backstrap. Fastening:Slip On Material Composition:Other Materials/Other Materials/Other MaterialsCare Instructions:Wipe Clean Gum Rubber outsole for increased traction and support. Fully molded Croslite foam uppers. Dark Gold rubber detailing on pivoting backstrap. Designed to enhance breathability. Easy to clean and quick to dry. Textured details around the heel, toe box, and collar. Customizable with Jibbitz charms. Iconic Crocs Comfort: Lightweight. Flexible. 360-degree comfort..