Old felt soles can be replaced, and new soles attached, with a little prep work and Aquaseal SR Shoe Repair adhesive.
To attach New felt soles, remove old felt (if necessary). Lightly roughen rubber soles with sandpaper then wipe rubber soles with Aqusaeal FD Cure Accelerator or isopropyl alcohol.
Attach Felt Sole to Boot
Apply Aquaseal SR to outer edge of new felt soles and attach to boot. Clamp in place and allow Aquaseal to dry level 8 to 12 hours.