Welted waterproof foot covering

Abstract

A foot covering includes a sole unit, a shell unit, and a welt. The shell unit has a substantially horizontal bottom wall, a peripheral wall extending upwardly from the bottom wall, and a protrusion extending downwardly from the bottom wall and elongated along the peripheral wall. The welt is attached to the sole unit and the shell unit, and has an inner part connected to the protrusion, and an outer part sewn to the sole unit.

1 . A foot covering, comprising:
 a sole unit;   a shell unit having a substantially horizontal bottom wall, a peripheral wall extending upwardly from said bottom wall, and a protrusion extending downwardly from said bottom wall and elongated along said peripheral wall; and   a welt attached to said sole unit and said shell unit, and having an inner part connected to said protrusion, and an outer part sewn to said sole unit.   
   
   
       2 . The foot covering of  claim 1 , wherein said inner part is sewn to said protrusion along a first stitch line, and said outer part is sewn to said sole unit along a second stitch line. 
   
   
       3 . The foot covering of  claim 2 , wherein said welt further includes an upper rib projecting upwardly from said inner part and adhered to said peripheral wall, and an indentation formed between said inner and outer parts, said first stitch line penetrating said inner part from said indentation to extend through said protrusion. 
   
   
       4 . The foot covering of  claim 2 , further comprising a cushion pad disposed between said bottom wall and said sole unit and within a space defined by said protrusion. 
   
   
       5 . The foot covering of  claim 4 , wherein said protrusion forms a loop at the bottom side of said bottom wall. 
   
   
       6 . The foot covering of  claim 4 , wherein said protrusion forms a portion of a loop at the bottom side of said bottom wall. 
   
   
       7 . The foot covering of  claim 1 , wherein said sole unit includes an outsole, and a pad adhered fixedly to a top face of said outsole, said welt being sewn to said pad. 
   
   
       8 . The foot covering of  claim 5 , wherein said welt extends around said loop of said protrusion. 
   
   
       9 . The foot covering of  claim 6 , wherein said welt extends around said portion of said loop of said protrusion. 
   
   
       10 . The foot covering of  claim 1 , wherein said bottom wall is provided with an opening.