the portable composite stadium seats or seat cushions described herein are compact , easily transportable , and convenient devices that include various features and qualities that are deficient or not found in other stadium seat cushions . the portable composite stadium seats or seat cushions can provide ergonomic comfort and support in addition to insulating features from temperatures of surfaces on which the composite stadium seat or seat cushion is placed . the portable composite stadium seats or seat cushions feature a sandwich structure of materials serving several complimentary functions . the ergonomic features of the composite stadium seat or seat cushion can include a contoured shape that conforms to the human anatomy in the buttocks region and can be sloped downward from the back face of the seat cushion towards the front face of the seat or cushion to facilitate proper back posture when a person is in a seated position . amongst other possible shapes , the composite stadium seats or seat cushions can be rectangular . in some implementations , the sandwich structure of the composite stadium seat or cushion includes three layers of material , a bottom layer , a top layer , and a core layer sandwiched between the bottom and the top layer . fig1 a - 1f are various views of an example of a composite stadium seat cushion 100 . in this embodiment , the composite stadium seat cushion 100 includes a bottom layer 130 , a top layer 110 , and a core layer 120 sandwiched between the bottom layer 130 and the top layer 110 . the top layer 110 is the element of the composite stadium seat cushion 100 on which a person can be seated . the top layer 110 can be formed from a pliable , durable , abrasion resistant , and / or waterproof material ( e . g ., neoprene .) the top layer 110 provides resiliency when subjected to continued and periodic use and when exposed to a variety of weather conditions . the top layer 110 partially protects the core layer 120 from exposure to ambient elements and from external contact related impact . the core layer 120 is an insulating layer that is adapted to retain the ergonomic shape of the composite stadium seat cushion 100 while providing contoured and cushioned support for sitting on the composite stadium seat cushion . the core layer 120 can provide an insulating barrier from surface temperatures on which the composite stadium seat cushion 100 is placed . in some embodiments , the core layer 120 can be formed from a pliable and thermally insulating material ( e . g ., closed celled foam ). the bottom layer 130 can be formed from a pliable , durable , abrasion resistant , and / or waterproof material such as rubber ( e . g ., rubber used for athletic shoes .) the bottom layer 130 provides resiliency when subjected to continued and periodic use and when exposed to a variety of weather conditions . the bottom layer 130 can also provide traction when placed on a surface and partially protects the core layer 120 from exposure to ambient elements and from external contact related impact . in some embodiments , the bottom layer 130 has a bottom surface with a traction pattern ( e . g ., similar to fraction patterns of shoe soles ). in embodiments where the composite stadium seat cushion is sloped downward from the back face towards the front face ( e . g ., in angles of 1 °, 2 °, 3 °, 4 °, 5 °, or more ,) the back face can have a height h 1 ( e . g ., of 1 inch , 1 . 25 inches , 1 . 5 inches , 1 . 75 inches , 2 inches , 2 . 25 inches , 2 . 5 inches , or more ) and the front face can have a height h 2 ( e . g ., of 0 . 75 inches , 1 inch , 1 . 25 inches , 1 . 5 inches , 1 . 75 inches , 2 inches , or more ,) to facilitate proper back posture when a person is in a seated position . in some implementations , the composite stadium seat cushion 100 can include a pocket insert 140 and an attachment pin 150 , as shown in fig1 b , to attach devices such as a carabineer or a clipping device for transporting the composite stadium seat cushion 100 . in this example , the pocket insert 140 is located at a corner of the composite stadium seat cushion 100 . in other embodiments , the pocket insert 140 can be located at other portions of the composite stadium seat cushion , such as the middle of a shorter one of the sides . the pocket insert 140 can be embedded in the core layer 120 and have a cavity 146 with an opening at one or more outside faces of the composite stadium seat cushion 140 . the cavity 146 can have a height h p ( e . g ., 0 . 75 inches , 1 inch , 1 . 25 inches , 1 . 5 inches , or more ) from the bottom surface 142 to the top surface 144 of the pocket insert 140 to accommodate an attachment device , for example . the attachment pin 150 is coupled to the bottom surface 142 and the top surface 144 of the pocket insert 140 such that attachment devices can be hooked onto the attachment pin 150 . in some embodiments , the attachment pin 150 is integral to the pocket insert 140 . in some embodiments , the attachment pin 150 is a component separate from the pocket insert 140 and can be attached to the pocket insert via bolts , screws , rivets , or adhesive , for example . in some embodiments , the composite stadium seat cushion 100 includes a load distribution element 148 , as shown in fig2 a . the load distribution element 148 provides structural support and form stability for the composite stadium seat cushion 100 . in some embodiments , the load distribution element 148 can be embedded within the core layer 120 . in some embodiments , the load distribution element 148 can be placed between the bottom layer 130 and the core layer 120 , or between the core layer 120 and the top layer 110 of the composite stadium seat cushion 100 . in some embodiments , the load distribution element 148 can be ring shaped . the load distribution element 148 can be coupled to the pocket insert 140 providing structural support when the pocket insert 140 is subjected to external loads ( e . g ., tensile loads ) through attachment devices that are coupled with the attachment pin 150 . the material used for the load distribution element can feature tensile and shear strength structural properties to withstand loads the composite stadium seat cushion is designed to endure . for example , when a concentrated tensile load is applied to the pocket insert , which may occur when the attachment device is subjected to a tensile load while the composite stadium seat cushion is constrained in some manner , the load path starts where the attachment pin is coupled with the pocket insert and is dispersed through the load distribution ring . the load path follows the load distribution ring along its longitudinal axis and gradually disperses to the enclosure material ( e . g ., the bottom , core , and / or top layer ) via shear and normal load transfer . the load transfer can be achieved by bonding and geometric interfaces between the contiguous components . in implementations , where loads are transmitted from the load distribution ring to the core layer , the loads can be dispersed to the extent that the shear loads are below the core layer &# 39 ; s yield shear values . in some embodiments , the load distribution element 148 can be integral to the pocket insert 140 . the load distribution element 148 can be formed from material , such as semi - rigid plastic , that does not crack or rupture when the composite stadium seat cushion 100 is rolled up or subjected to loads that are applied to the composite stadium seat cushion during ordinary use ( e . g ., sitting on or transporting the composite stadium seat cushion .) while the composite stadium seat cushion 100 as shown in fig1 and 2 is rectangular ( e . g ., with a width w of 10 inches , 11 inches , 12 inches , 13 inches , 14 inches , or more , and a depth d of 7 inches , 8 inches , 9 inches , 10 inches , 11 inches , or more ) with rounded corners , other shapes and configurations are also possible . for example , the composite stadium seat cushion can be circular , oval , triangular , octagonal , hexagonal , etc . the described composite stadium seats or seat cushions can be fabricated by well - known methods , including injection molding , laminating , multiple axis milling , and 3d printing . for example , the individual elements of the composite stadium seats or seat cushions , such as the bottom layer , core layer , top layer , pocket insert , attachment pin , and / or load distribution element , can be formed separately , by injection molding . in some embodiments , various elements of the composite stadium seat or seat cushion can be integrally formed . for example , the attachment pin and / or load distribution element can be integral to the pocket insert . fig2 a and 2b illustrate an example of separately formed elements of the composite stadium seats or seat cushions . in some embodiments , the top layer 110 can be injection molded from material such as neoprene . the material properties of the molded top layer 110 can include non - marking , weather resistant , and suitable for indoor and outdoor use . the bottom layer 130 can be injection molded from material such as rubber . the material properties of the molded bottom layer 130 can include non - marking , weather resistant , suitable for indoor and outdoor use , and a high durometer or hardness ( e . g ., comparable to a durometer of rubber found in shoe soles .) in some embodiments , the bottom layer 130 includes a traction pattern on the bottom surface 132 ( e . g ., a tread like pattern ) to provide traction when placed on a surface , as shown in fig1 c , 1 e , and 1 f . the pocket insert 140 and the load distribution element 148 can be injection molded from material such as plastic . the material properties of the molded pocket insert 140 and the load distribution element 148 can include non - marking , weather resistant , and suitable for indoor and outdoor use . in some embodiments , the load distribution element 148 is attached to the center of the pocket insert 140 , as shown in fig2 a , to position the attachment location at about the neutral axis of the composite stadium seat cushion 100 . this configuration can reduce eccentric loading that may otherwise cause discomfort or premature wear when seated on uneven surfaces , for example . in some embodiments , the load distribution element 148 is integral to the pocket insert 140 . the attachment pin 150 can be injection molded from material such as plastic with properties similar to the pocket insert 140 . the attachment pin 150 can be integral to the pocket insert 140 or a separate component . in embodiments where the attachment pin 150 is a separate component , the attachment pin 150 can be coupled to the pocket insert , for example , via attachment hardware , such as screws , bolts , rivets , etc ., or bonded via adhesives . in some implementations , the attachment pin may also be screwed in or inserted into a slot and secured with an adhesive . in some embodiments , the attachment pin 150 can be fabricated from a durable material , such as plastic , fiber reinforced plastic ( frp ), steel , or aluminum , for example . the core layer 120 can be injection molded from material such as closed cell foam ( e . g ., medium density closed cell foam .) the material of the core layer 120 can include thermally insulating properties suitable for indoor and outdoor use . the core layer 120 can be lightly compressible to provide comfort , but generally retain its shape to provide structural support for the composite stadium seat cushion 100 . for example , the material of the core layer 120 can feature elastic properties that allow compression with minimal strain or low percentage of deformation from the original shape of the core layer . in some embodiments , the pocket insert 140 and / or the load distribution element 148 are embedded in the core layer 120 . the pocket insert 140 and / or the load distribution element 148 can be placed and secured within the mold for the core layer 120 . during the injection molding process of the core layer 120 , the injected material encases , at least partially , the pocket insert 140 and / or the load distribution element 148 . the separately fabricated elements of the composite stadium seat or seat cushion can be bonded together , for example by using an adhesive ( e . g ., cement or adhesive used for bonding components of a shoe to each other .) in the assembled configuration , the top layer 110 and the bottom layer 130 can provide the rigid portion of the composite stadium seat 100 , while the core layer 120 provides the softer portion . this sandwich configuration can provide benefits such as load distribution that results in substantially uniform support when seated on a level or uneven surface and protection from external wear and tear ( primarily by the bottom and top layers ,) while achieving thermal insulation from surfaces on which the composite stadium seat cushion is placed ( primarily by the core layer .) it is noted that the described embodiments of a composite stadium seat or seat cushion described herein are exemplary and different variations in structure , design , application and methodology are possible .