Seamless Linings Custom Fit System Seamless Sorbtek linings with anti-microbial shield provide a dry foot environment and comfortable fit. Custom Fit System The InStride Custom Fit System (CFS) provides 2-3 levels of comfort and meets the changing needs of the hard to fit feet. The 2-3 removable insoles can be used in any combination to customize the shoe or allow sufficient room for an orthotic insert. Meets Medicare Shoe Billing Requirements Stride Glide™ Stride Glide bisects outsole and midsole to provide lateral and medial stability as well as shank support. Stridelite Midsole STRIDELITE mid-sole for lightweight comfort or compression molded EVA midsole.