Danner DLC Memory Foam Footbed 8.5. It was designed as a replacement footbed for the Caliper work boots but it fits any boot made on the DPDX last including the Mountain 600. The dual-layer footbed pairs soft memory foam and polyurethane for maximum underfoot cushioning. Features of Danner DLC Memory Foam Footbed The Danner Dual Layer Comfort footbed is constructed from plush memory foam and polyurethane to provide instant and long-lasting comfort Non-Insulated Package Contents: Danner DLC Memory Foam Footbed Danner 90646-8.5: DLC Memory Foam Footbed 8.5