the invention is best understood by reference to fig1 - 11b illustrating a hat liner or liner 10 for fitting inside a hat 11 , and made according to the invention . the liner 10 has a core layer or core 12 to which an adhering layer 14 is attached opposite an absorbing layer 16 . the liner 10 is configured to be securable by the adhering layer 14 to the sweatband 18 in the crown 20 of the hat 11 . the sweatband 18 is typically sewn inside the crown 20 to extend the entire circumference 25 of the head or the crown 20 as shown . the absorbing layer 16 is positionable at the time of installation of the liner 10 on a sweatband 18 to contact the head of a user in lieu of the sweatband 18 . in fig1 - 3 , the liner 10 is positioned in a hat 11 . the liner has a circumferential ( also called longitudinal ) arcuate length or length 22 . the length 22 may be such that the liner 10 is positionable to extend only about the forehead or brow of a user as in fig1 - 2 . alternatively , the length 22 may be sufficient to extend in the circumferential direction 24 completely around the circumference 25 of the sweatband 18 of the hat 11 , as in fig3 . as illustrated in fig4 a , the width 26 is selected to extend in an axial direction 28 to cover the sweatband 18 of the hat 11 . however , the thickness 30 of the liner 10 , in the radial direction 32 , may be selected to meet one of several different criteria including thinness of profile or thickness for adjustment of ( sizing ) the hat 11 . the liner 10 may be constructed in several effective configurations , each securing certain distinct advantages . the construction and installation of the liner 10 may vary as illustrated in fig1 - 11b , affecting the width 26 , thickness 30 , length , or any combination thereof . in several embodiments , a user may have the option to selectively alter the length 22 , width 26 or thickness 30 of the liner 10 prior to installation of the liner 10 in the hat 11 . structural construction of the liner 10 is best understood by referring to fig1 - 11b . in fig1 - 3 the liner 10 is formed of at least three layers , the core 12 , the adhering ( first ) layer 14 , and the absorbing ( second ) layer 16 . in this configuration of fig3 the length 22 of the liner 10 extends around the entire circumference 25 of the crown 20 of the hat 11 . the core 12 may be a flexible solid , but is preferably formed of an expanded polymer . the core 12 may be comprised of a foamed polymer such as polyethylene , polystyrene , natural rubber , any synthetic rubber , latex , polyurethane or the like . the foamed polymeric material of the core 12 may be of closed - cell or open - cell type , and may be treated by coating , impregnating , molding or diffusion to include deodorizing agents such as a chemical absorbing agent 13a , like charcoal , antibacterial agent 13b , fragrance 13c , or a combination thereof . open cell foam typically is impervious to liquids , while open - cell foam is usually absorbent . if open - cell foam is used , potential absorption of the liner 10 may be increased . in such a construction , the adhesive layer 14 may be impermeable , or may be a substrate having adhesive disposed thereon to be impermeable ( see fig1 ). if an open - cell foam core 12 is used that is not impervious to liquids , an adhesive layer ( first layer ) 14 can be made permeable or non - continuous to pass liquids to the hat . however , such a configuration is primarily useful where the liner 10 is designed only as a sweatband for the user , not to protect the hat 11 . to protect the hat 11 , the core 12 should have an impermeable skin or layer 15a ( see fig4 a ) on at least one side 17a and may be made entirely of an impermeable material . an impermeable material ( liquid barrier ) may be attached to , or formed integrally with , the core 12 , the first layer 14 , or both , to prevent passage of liquids such as water and oil to the crown 20 of the hat 11 . alternatively , the adhering ( first ) layer 14 may include a continuous and impervious material . in the liner 10 of fig4 a - 9b , the core 12 , adhering layer 14 and absorbing layer 16 may each be formed as a monolithic unit of a single material . the layers 12 , 14 , 16 are stacked in a radial direction 32 and bonded together by heat , solvent , seams or intermediate adhesive ° a tab portion 34a may be folded at a bend 36a to size or edge the liner , but may be trimmed off , or left unfolded . the liner 10 may be sewn to itself ( see fig5 c ) to make a permanent fold 36a ; or it may be bonded by heat , solvent , glue or the like ( see fig5 b ). the tab portion 34a may be secured by an adhesive layer 14 folded back on itself , or by folding the core 12 back over an adhesive layer 14 covering part of the core ( see fig6 a - 7c ). fig4 a illustrates the basic configuration of the liner 10 installed in the hat of fig3 . the individual thicknesses 44a , 44b , 44c , corresponding to the core 12 , adhering layer 14 , and absorbing layer 16 , respectively , may be selected to alter the thickness 30 of the liner 10 . a liner 10 with the tab portion 34a absent or not folded fits more closely against the sweatband 18 with a thinner profile ( thickness , 30 ) as in fig4 a . the core 12 and an absorbent layer 16 may be folded , or the absorbent layer 16 alone may be folded . the tab portion 34a of the liner 10 may be folded to remain against the inside face 38a , the sweatband 18 , or may be folded over against the outside face 38b , between the sweatband 18 and the crown 20 of the hat 11 as in fig4 b . the tab portion 34a may form a finished edge 40a , with a free edge 42b remaining opposite . the length 46a of the tab portion 34a may be selected to control the effective width 26 of the liner , and the position of the free edge 42b proximate the brim 21 . fig4 c illustrates a liner 10 having a tab portion 34a folded along the circumferential direction 24 at a fold 36b , but positioned on the inside face 38a of the sweatband 18 . the core 12 is bonded to itself by solvent , glue or similar mechanism distinct from the adhering layer 14 . the adhering layer 14 does not contact the sweatband 18 along the entire width 26 of the liner 10 , but may be disposed to extend along the entire width 26 after the tab portion 34a is folded . fig4 d illustrates a configuration similar to the configuration of fig4 c , with respect to the liner 10 . however , the liner 10 is oriented with the finished edge 40a positioned proximate the brim 21 . the effective thickness 31 of some configurations may vary ( bulge ) due to the folding of the tab portion 34a , or a layer such as the core 12 may be thinned prior to folding to maintain a uniform effective thickness 31 after folding . fig5 a is an unfolded liner 10 , also called a &# 34 ; blank &# 34 ; which can be folded at the bend 36a to the configuration of fig5 b . the core 12 is bonded at face 43a to itself along the distance 45a . alternatively , as in fig5 c , the liner can be stitched with thread 47 . a distance 45b for clearance from the free edge 42b may be provided for the adhering layer 14 . fig6 a is a blank of the liner 10 of fig6 b . the length 46a of the tab portion 34a is folded over along the fold 36a to contact the adhering layer 14 . the adhering layer 14 binds the tab portion 34a to form the finished edge 40a , rather than any distinct bonding means or the thread 47 . the width 46a may optionally serve as the width 45b of clearance between the free end 42b and the adhering layer 14 ( see fig5 b ) is to prevent a tacky , adhesive result when edge 50 is exposed to an environment from which dust and debris may collect . both widths 45a , 45b may be sufficient to permit two tab portions 34a , 34b to be folded along bends ( folds ) 36a , 36b to be secured to the adhering layer 14 , fig7 a illustrates a blank for the liner 10 , provided with an adhering layer 14 extending along virtually the entire width 26 . the blank 10 may be folded as in fig7 b or as in fig7 c . the tab portions 34a and 34b can be formed to be of any practical width 46a , 46b , respectively , and may even overlap one another . a method of adhering the liner to the sweatband may include placing the tab portion 34a on the outer face 38b of the sweatband 18 as illustrated in fig4 b . trimming and overlapping the tab portions 34a , 34b provides three optional thicknesses 30 for the liner inside the sweatband , corresponding to one , two or three stacks of the three layers 12 , 14 , 16 . fig8 a illustrates how the thickness 30 and effective thickness 31 of the liner of fig5 c may be adjusted by addition of a buildup layer 48a . the buildup layer 48a adheres at the face 49a , which may be adhesive - coated or not , to the adhering layer 14 . thus , the adhering function of the adhering layer 14 , with respect to the sweatband 18 is replaced by the face 49b which is adhesive . fig8 b is a blank of the liner 10 . the widths 45a , 45b accommodate insertion of all or none of the buildup layers or thickness layers 48a , 48b , 48c under the tab portions 34a , 34b when folded to the configuration of fig8 c . for example , a double - sided , adhesive - coated , foamed polymer may be used for the adhesive layer 14 . with addition of multiple adhesive layers 48a , 48b , 48c of such construction , a user may selectively adjust the effective circumference 25 of the sweatband 18 of the hat . manufacturing may be simplified by making the liner 10 in a continuous strip cut to length 22 , with the edges 50 folded by a user after exposing adhesive coated surfaces 49a , 49b of the first layer 14 , or of added thickness layers 48a , 48b , 48c . fig9 a and 9b illustrate a liner 10 in which the tab portions 34a , 34b are formed only from the absorbing layer alone , to reduce effective thickness 31 . addition of the optional buildup layers 48a . 48b is illustrated in fig9 b . the configuration of fig9 b results from a blank 10 analogous to that shown in fig8 b . fig1 illustrates how each of the layers 12 , 14 , 16 may itself be formed from multiple lamina 51a - 51j to provide any individual feature ( resilience , thickness , absorption and release of agents , absorption of moisture ) in addition to another inconsistent feature ( structural stability , high strength to weight ratio , high strength to volume ratio , imperviousness ). for example , a resilient pad 51a may be backed with an impervious strip 5 1b . likewise , the first layer 14 may be an adhesive material applied to the core 12 , or a separate structural substrate ( e . g . tape ) having an adhesive applied to both sides ( faces ) 49a , 49b . each structure has advantages in manufacturing and performance . fewer materials and fewer structurally distinct layers 48a , 48b , 48c will usually reduce manufacturing costs . additional layers 12 , 14 , 16 , 48a , 48b , 48c facilitate customizing performance and physical characteristics of the liner 10 . a substrate 51c may have adhesive coats 51d , 51e and an impervious layer 51f . the absorbing layer 16 may include an absorbent pad 51g of paper or other natural or synthetic fiber , including cotton , polyester , and polypropylene . a cover layer or stay - dry lining 51h may serve to keep liquids , preferentially wicked into and retained in the absorbent pad 51g , away from a user . the absorbent pad 51g is preferably a wick for liquids , and may be formed of a variety of synthetic materials such as dacron , polyester and polypropylene used alone or in combination with natural fibers such as cotton and paper , whether in woven or non - woven fabrics . natural materials may be used alone as well . an absorbent layer 16 may extend above the core 12 a distance 56 , or above the core 12 and sweatband 18 a distance 57 . the absorbent layer 16 may thus wick liquid away from the head of a user and from the hat 11 to be evaporated to maintain dryness . that is , the absorbent pad 51g is effective to wick liquids away from the user through the cover layer 51h . the cover layer 51h becomes a &# 34 ; stay - dry &# 34 ; type of lining to keep the absorbent pad 51g from releasing moisture to the hat 11 while promoting drawing moisture away from a user . then , moisture can evaporate from the absorbing pad 51g as a vapor through the cover layer 51h without contacting the crown 20 and the hat 11 . an adhesive layer 51j may be required , or another bonding method such as heat or solvent between layers 12 and 16 , or between pairs of faces 51k . any or all of the lamina or layers 51a - 51j may be included in a liner 10 of most embodiments of the invention . a latex foam core 12 coated with a firm , permanently tacky adhesive as the adhering layer 14 and bonded to terry cloth as the absorbent layer 16 , is preferred . an absorption 13a or antibacterial agent13b may be impregnated into the latex foam or the terry cloth to deodorize the liner 10 . charcoal is an excellent absorbing agent 13a for neutralizing odors . deodorizing agents , l3a , 13b , 13c whether absorbent , anti - bacterial or fragrant , respectively , may be impregnated into the core 12 , molded with the polymer , or applied to the core 12 or absorbent layer 16 , each with a somewhat different result . for example , agents 13a , 13b , 13c disposed within closed cell foam may tend to operate or release faster than agents 13a , 13b , 13c in open cell foam . likewise , agents 13a , 13b , 13c disposed in the fibers of a fabric or bat of the absorbent pad 51g may release faster than those in a polymeric foam core 12 . likewise , polymeric foams may release agents 13a , 13b , 13c or maintain them active over a longer period than would cotton , fabrics , paper and other materials of the absorbent layer 16 . fig1 a illustrates a liner 10 having bevelled edges 54a , 54b , preferably formed prior to application of the adhering layer 14 . if a substrate 51f is used , the bevelled edges 54a , 54b can be warped to fit flat against the adhering layer 14 which will hold the shape of the liner shown in fig1 b . alternatively , the liner may appear as illustrated in fig1 a , and be installed by a user to appear as in fig1 b . in fig1 b , the liner 10 is positioned on the sweatband 18 inside the crown 20 of a hat 11 . the core 12 bends along the bevelled edges 54a , 54b to conform to the sweatband 18 . the adhering layer 14 secures the flexible core 12 and the absorbing layer 16 , near the free edges 42a , 42b , to the sweatband 18 . installation and prior adjustment or configuration of the liner 10 by a user is best understood by referring to fig1 - 11b , and particularly fig1 - 4d . the liner 10 may be installed in the hat 11 in a variety of orientations and by a variety of methods . the methods and orientations are not necessarily equivalent , each securing certain advantages and disadvantages to a user . a tab portion 34a may be folded at a bend or fold 36a extending along the length 22 of the finer 10 . a second tab portion 34b , or none at all , may be likewise folded . the tab portion 34a may be folded into place prior to installation or as part of installation of the liner 10 . the tab portion 34a may be placed against the inside face 38a of the sweatband 18 or on the outside face 38b between the crown 20 and the sweatband 18 . the resulting finished edge 40a may be positioned near the brim 21 or away from the brim 21 . the user may install a liner 10 in a hat 10 without modification prior to installation , if all configuration options have been exercised by the manufacturer . the sewn configurations of fig5 c and 8a may be configured by a manufacturer , with the free edges 42a , 42b configured to be trimmed by a user in these as well as any embodiment having free edges 42a , 42b before installation . a distributor may stock numerous liners 10 in a variety of configurations , sizes and other optional parameters . alternatively , a user may configure the liner 10 prior to or during installation . for example , a user may trim the liner 10 of fig4 a to a desired width 26 , starting with a standard blank . likewise , the liner may be sold as a blank , ( see e . g . fig6 a - 9b ) to be configured by a user . for example , a user may fold the liners 10 as desired to achieve a specific width 26 . also , a configuration may require that a user select the length 46 of the tab portion 34a , 34b folded to alter the width 26 or effective thickness 31 . the alternate embodiments of fig8 a , 8b , 8c , and 9b are configured to have multiple buildup layers 48 , also identified individually as 48a , 48b , 48c . thus the thickness 30 or effective thickness 31 of the liner 10 may be adjusted . as with the liners 10 having adjustable widths 26 , some liners 10 may be trimmed at an edge 50 after adjustment of the thickness 30 , but prior to folding and installation . for example , the embodiments of fig8 a - 9b may be adjusted in thickness 30 by application of thickness layers 48a , 48b , 48c as desired , and all but the liner 10 of fig8 a may be trimmed at the edges 50 prior to folding . referring to fig1 a and 11b , the liner 10 or the core 12 may be bevelled on a back face 52 prior to application of the adhering layer 14 . upon installation of the adhering layer 14 against the sweatband 18 , the bevelled edge 54 conforms to the sweatband 18 providing a finished appearance at the free edges 42a , 42b . the liner 10 has a small overall effective thickness 31 ( profile ) without the bulk of a folded tab portion 34a , 34b . while preferred embodiments of the invention have been described with specific reference to the drawings , it should be understood that the invention is not thereby to be limited . further it should be understood that the invention may be readily adapted for use in configurations different from those illustrated without departing from the invention .
a disposable liner is fitted against the inside surface of a sweatband of a cap or hat . the liner functions to absorb moisture and oils , and to eliminate odor . the liner wicks moisture away from a user and may hold moisture away from the hat . the liner may wick moisture to an evaporation region to be evaporated . the evaporation region may be separated from the hat by a cover layer to prevent wicking into the crown of the hat . the liner may be configured to adjust the size , and thus the fit of the hat on the head of the user . to secure a hat on the head of a user , the liner may include a compressible , foamed , polymeric core . the core may be treated with an antibacterial agent and a deodorizing agent for eliminating odors . to one side of the core is attached an adhesive layer for securing the to the sweatband of the hat . the adhesive is selected for firmness yet easy removal and disposal of the liner . the adhesive may be heat - sensitive . multiple layers of foamed polymeric substrates coated on two sides with adhesive may be adhered to one another for sizing a hat . the other side of the core is bonded to a fabric layer positionable against the forehead of a user . the fabric layer may be formed to have an absorbent layer , and may include a non - absorbent outer layer that transfers moisture but remains dry to the touch .