Abstract: A kit for producing and method for positioning a cover or trapdoor which is height-adjustable includes providing a frame adapted to be mounted on a base in a manner that is telescopically slidable to a limited extent therein so to be height-adjusted with respect to the base, and at least one cover member which is detachably coupled to the frame and which is adapted to be received in an opening thereof, and providing the as a mold adapted to produce the base from reinforced concrete.

Abstract: A fit adjustable footwear, includes an insole, having a top layer and a bottom layer, mutually facing and kept spaced thereamong in correspondence of at least one length of the external peripheral edge thereof to slidably house a plurality of support elements arranged in a sequence and interconnected by a pulling element, the tensioning of which allows to radially let out, of a desired length, the support elements from the top and bottom layers.