Reversible multi-purpose liner

A footwear product comprising:

• a plurality of inserts that are reversibly placeable on a footbed of a piece of footwear;
• wherein each of said inserts comprise a top and a bottom;
• wherein at least one of said plurality of inserts further comprises a bladder;
• wherein said bladder comprises at least one chamber which is filled with at least one filler;
• wherein each top comprises at least two functional outer surfaces which are separate from one another and wherein each said bottom comprises at least two functional outer surfaces which are separate from one another;
• the outer surfaces of each insert defining a profile analogous with the shape of a foot such that each insert may be oriented with any one of the multiple functional outer surfaces in contact with a foot of a wearer of the piece of footwear and an opposite one of the multiple functional outer surfaces in contact with the footbed of the piece of footwear;
• wherein the outer surfaces of each respective one of the plurality of inserts have different properties;
• wherein each one of the plurality of inserts has a unique combination of outer surfaces that is different from each other one of the plurality of inserts;
• wherein said bladder further comprises at least one baffle which inhibits movement of said at least one filler.