A kit for containing components for fabricating functional casts, and including a box, and a length of liner for being placed next to the skin of the body part to be immobilized; a moisture-proof package containing a length of cast tape of the type impregnated with a moisture-curable resin that remains in a flexible, comformable state until activated and hardened into a rigid state by exposure to moisture; at least one strap for securing the cast onto the body part being immobilized and a length of adhesive edger material for enclosing raw edges of the hardened cast tape for protecting the skin of the cast wearer from exposure to the cast tape, each of which is contained in the box.