the present invention provides replacements for both a crib &# 39 ; s fitted sheet and a mattress pad . the waterproof nature of the pad protects the underlying mattress from potential soiling . if the pad is soiled , it is simply unfastened from the bottom layer , washed , and reused . referring to fig1 through 3 , schematic representations of the detachable waterproof pad system are illustrated according to one embodiment of the present invention . fig1 through 3 illustrate one embodiment of the present invention where a fastening means has oval - shaped corners and is located at the edge of the mattress . in fig1 through 3 , the top layer pad covers the entire top surface of the mattress and it has a non - continuous stitching pattern format . fig4 through 6 illustrate schematic representations of the detachable waterproof pad system according to another embodiment of the present invention . fig4 through 6 illustrate another embodiment of the present invention where a fastening means has a rectangular shape and is located away from the edge of the mattress . in fig4 through 6 the top layer pad covers a substantial portion of the top surface of the mattress and it has a continuous stitching pattern format . referring to fig1 , the detachable waterproof pad system is designed to be used in a crib 10 to cover a mattress 20 entirely or substantial portions thereof . the mattress 20 in the crib 10 is generally supported by a frame 30 . the detachable waterproof pad system generally includes a bottom layer 40 and a top layer pad 50 . the bottom layer 40 in fig1 is a fitted sheet that covers the mattress 20 . the bottom layer 40 in fig1 only covers the sides of the mattress 20 and the mattress 20 can be seen in the void not covered by the bottom layer 40 . the top layer pad 50 ( shown in fig2 ) is removably attachable to the bottom layer 40 by way of first fastening means 60 . the first fastening means 60 , in one embodiment , is a two - part fastening system with a bottom portion attached to the top surface of the bottom layer 40 and a top portion attached to the bottom surface of the top layer pad 50 . the top and bottom portions of the first fastening means 60 cooperate to fasten the top layer pad 50 to the bottom layer 40 such that the top layer pad 50 does not move relative to the bottom layer 40 . in the embodiment illustrated in fig1 , the bottom portion of the two - part fastening system is configured to cover the perimeter of the mattress 20 . the complementary top portion of the two - part fastening system also covers the perimeter of the top layer pad 50 such that each section of the bottom portion on the top surface of the bottom layer has a corresponding top portion on the bottom surface of the top layer pad 50 . referring to fig2 , another schematic presentation of the system illustrated in fig1 is shown . the top layer pad 50 of the detachable waterproof pad system according to one aspect of the invention is shown . in the figure , the top layer pad 50 is laid on top of the bottom layer 40 and on top of the mattress 20 . fig3 is a cross - sectional diagram of the system illustrated in fig2 along the lines a - a . it should be noted that , for simplicity , the cross section of most of the frame 30 is not shown in fig3 . as can be seen in fig3 , the bottom layer 40 is a fitted sheet constructed and arranged to fasten around a crib mattress 20 . the bottom layer of fitted sheet 40 has a top surface adjoining a top surface of the mattress 20 and a bottom surface adjoining a bottom surface of the mattress 10 . the bottom surface of the mattress 10 is adjacent to a portion of a crib frame 10 . in a preferred embodiment , the bottom layer 40 is equipped with a second fastening means for mounting the bottom layer fitted sheet around the top surface 50 and around the bottom surface 60 of the mattress 10 . this second fastening means can be made of elastic bands . the second fastening means is deployed to hold the bottom layer tightly against the mattress 20 . in the embodiment illustrated in fig3 , the bottom layer 40 has second fastening means which include a unitary elastic band 70 around the top surface of the mattress and a zipper 80 for mounting the bottom layer fitted sheet 20 to the bottom surface of the mattress 10 . other fastening means for holding the bottom layer 40 tightly against the mattress 20 may also be used . buttons , snaps , drawstrings and / or combinations of such fasteners may be employed . it should be noted that the bottom layer fitted sheet 40 can be made of any type of natural fabric material or synthetic fabric material . in the preferred embodiment , the material used is a polyester material to maintain greater durability in everyday use . again referring to fig3 , the top layer pad 50 of the detachable waterproof pad system can be constructed and arranged to entirely cover the top surface of the mattress 10 as well as the top surface of the bottom layer fitted sheet 40 . the top layer pad 30 can have either rounded corners as shown in fig2 . the top layer pad 30 may consist of three layers , a bottom waterproof layer 90 , a middle absorbent layer 100 , and a top fabric layer 110 . these layers can form a substantially unitary article . it should be noted that the height and the texture of the top layer pad 50 are important as having a pad which is too thick or too soft may cause suffocation . therefore , the overall thickness of the top layer pad 50 is approximately 6 mm and is purposely stitched in a specific pattern format to ensure that the middle absorbent layer stays evenly distributed such that it remains at a constant height or thickness . these precautionary designs further reduce the risk of sudden infant death syndrome . it will be apparent to a person skilled in the art that the way the top layer pad 50 is sewn together or quilted can have a variety of stitching pattern formats to ensure that the middle absorbent layer stays evenly distributed . for example , sewn or quilted patterns , such as loops , diamonds , and squares , may be used . furthermore , continuous or non - continuous stitching patterns may be used . fig2 illustrates the use of a non - continuous stitching pattern . the bottom waterproof layer 90 of the top layer pad 50 protects the underlying mattress 20 and fitted sheet 40 from potential soiling . the bottom waterproof layer 90 can be made of any type of water resistant or waterproof material . in the preferred embodiment , the material used is a waterproof tent fabric , such as a mixture of polyester with plasticized polyvinyl chloride ( pvc - p ). the middle absorbent layer 100 of the top layer pad 50 serves the function of retaining soil or waste of a baby lying on the top layer pad 50 . the middle absorbent layer 100 can be made of any type of natural or synthetic material that is fluid absorbent . in the preferred embodiment , the material used is a synthetic blend of polyester and viscose rayon . the top fabric layer 36 is used to increase the comfort and aesthetic appeal for the user . the top fabric layer 36 can be made of the same material as the bottom layer fitted sheet 20 so that the color , texture , and design between the two matches and the appearance of the whole pad system can be eye - pleasing . therefore , similar to the bottom layer fitted sheet 20 , the top surface layer 36 can be made of any type of natural fabric material or synthetic fabric material . in the preferred embodiment the material used is a polyester material to maintain greater durability in everyday use . the top layer pad 50 can have an overall thickness of anywhere from ½ inch to ¼ inch . other dimensions are , of course , possible . also illustrated in fig3 are the bottom portion 120 and the top portion 130 of the two - part fastening system . as can be seen in fig3 , the two part fastening system is positioned to be at the very edge of the mattress 20 and the very edge of the top layer pad 50 . this positioning ensures that , at their respective edges , there is no gap between the top layer pad 50 and the mattress 20 as the points of contact between the top layer pad 50 and the bottom layer 40 are covered by the first fastening means . in a preferred embodiment , a hook and loop fastener means is used as the first fastening means to couple the top layer pad 50 to the bottom layer 40 . the hook portion of the hook and loop fastener can be the bottom portion while the loop portion of the hook and loop fastener can be the top portion of the two - part fastening system . as can be imagined , the embodiment illustrated in fig1 - 3 uses strips of hook and loop fasteners or a continuous strip of hook and loop fasteners at each edge of the mattress 20 . the use of such a hook and loop fastener provides a substantially immovable sleeping arrangement for a baby and to further provide an easy removal and replacement padding system for parents . however , any other alternative fastening means known in the art may be used to provide tautness and a snug fit between the top layer pad 50 and the bottom layer 40 . the first fastening means restrains the movement of the waterproof pad system while maintaining easy attaching and detaching mechanisms . referring to fig4 , an alternative embodiment of the detachable waterproof pad system is illustrated . as can be seen , the bottom portion of the first fastening means is positioned on the top surface of the bottom layer to not be at the very edge of the mattress 20 . in this embodiment , the top portion of the first fastening means is correspondingly positioned at the bottom surface of the top layer pad . referring to fig5 , the alternative embodiment shows that the top layer pad 50 need not completely cover the mattress . as can be seen , the top layer pad 50 is covers an area smaller than the top area of the mattress 20 . the top portion of the first fastening means is positioned at the edge of the bottom of the top layer pad to cooperatively form a seal between the top layer 50 and the bottom layer 40 by way of the first fastening means . fig5 also shows the use of a continuous repeating square stitching pattern on the top layer pad 50 of the system . as noted above , other stitching patterns and designs may be used . referring to fig6 , a cross - sectional view of the system along lines b - b is illustrated . similar to the embodiment illustrated in fig3 , the embodiment in fig6 has a top layer pad 50 and the bottom layer 40 of the detachable waterproof pad system being releasably connected by a washable hook and loop fastener means . the top layer pad 50 has a top portion of the first fastening means 130 on the outer perimeter of the side facing downwardly and away from the waterproof layer 90 to operatively couple to the bottom portion of the first fastening means 120 on the bottom layer fitted sheet 40 . the bottom portion of the first fastening means 120 can be located away from the top edge of the bottom layer 40 as illustrated in fig6 . the top portion of the first fastener means 130 on the top layer pad 50 is intentionally mounted at the edge of the top layer pad 50 along the bottom waterproof layer 90 to construct a substantially immovable top layer pad 50 , and to prevent holes , gaps , or other openings in which the baby &# 39 ; s head can be caught . to releasably disengage the hook and loop fastener means of the present invention , one merely needs to place a finger between the bottom portion of the first fastening means 120 and the top portion of the first fastening means 130 . these two portions are then pulled away from each other to disengage them from one another . it should be noted that the embodiment illustrated in fig6 differs from the embodiment in fig3 in that the embodiment in fig6 uses two unitary elastic bands as its second fastening means . the first unitary elastic band 70 is positioned at the top of the bottom layer while the second unitary elastic band 70 a is positioned at the bottom of the bottom layer 40 . the unitary elastic band 70 around the top surface of the mattress mounts the bottom layer 40 to the top of the mattress 20 while the second unitary elastic band 70 a mounts the bottom layer 40 to the bottom surface of the mattress 20 . other fastening means for holding the bottom layer 40 tightly against the mattress 20 may also be used . buttons , snaps , drawstrings and / or combinations of such fasteners may be employed . in a further preferred embodiment , the waterproof pad and / or the accompanying bottom layer can be cleaned and can be constructed to be able to withstand any ordinary washer and dryer . a further advantage to the invention is that it allows for better airflow around and through the mattress . previously , plastic layers or components were required for mattresses to be used by infants to protect against infant waste . because the waterproof nature of the waterproof pad system already protects against this eventuality , mattresses for use by infants no longer need to have such plaster layers or components . the use of non - plastic layers or components in the mattress allows for better airflow and thereby prevents infants from overheating . it should be noted that the prevention of overheating in infants is one of the recommendations for preventing sids . although the illustrated detachable waterproof pad system is designed for use in a crib , the invention is useful on all bed sizes and can be manufactured in any desired size . furthermore , it can be used on sofas , chairs , seats , and pillows . a person understanding this invention may now conceive of alternative structures and embodiments or variations of the above all of which are intended to fall within the scope of the invention as defined in the claims that follow .
systems relating to a safe and easily removable and reusable waterproof pad with accompanying bottom layer that attaches to a crib mattress . the detachable waterproof pad of the present invention seeks to reduce the risk of sudden infant death syndrome by providing a tightly fitted pad to comply with current sids recommendations . the pad can be changed , cleaned , and replaced frequently .