Pemko 216PWV36 "U" Door Bottom with Vinyl Seal 36". White Finish Aluminum with White Eco-V insert. The 1-3/4" "U" style door shoes are used to seal the area under a door with minimal affect on the appearance of the face of the door. In addition to sealing the gap under the door, door shoes are often used to provide protection for the bottom of the door. This shoe is designed to seal a gap of 3/8" to 1/2" from bottom of the door. Screw holes are slotted for adjustment.