Columbia Montrail Men's Enduro-Sole Trail Runner 100% PRFRM thermo-moldable foam Imported Synthetic sole TECHNOLOGY: This men's insole features a PRFRM thermo-moldable top layer MATERIAL: This insole is constructed of a wicking, thermo-moldable material that molds perfectly to your unique foot. HANDY FEATURES: The insole features a high-rebound heel pad and arch support. RECOMMENDED: The Enduro-Sole insert is recomnended for every activity goer and works great for higher volume shoes. With this super comfortable, wicking insert, your running shoes will feel comfortable and custom made.