the beverage container of the invention is designed to overcome the shortcomings described in the prior art . it is a drinking container formed from two main parts — an inner core ( 4 ), shown separately in fig3 , and an outer shell ( 10 ), shown separately in fig4 . the other figures show the assembled cup , made up of the inner core ( 4 ) inside the outer shell ( 10 ). referring to the figures , the first par of the container is an inner core ( 4 ) with an open top ( 20 ), an open ( as drawn ) or closed bottom ( 21 ), and side walls ( 22 ) enclosing a central chamber ( 23 ). the inner core ( 4 ) is roughly cylindrical with a long gap ( 6 ) spiraling down from the inner surface ( 31 ) of the side walls ( 22 ) through to the outer surface ( 32 ) of the side walls ( 22 ), from the top ( 20 ) to the bottom ( 21 ). at the bottom ( 21 ) is a large gap ( 5 ) on both sides of the core ( 4 ) connected on the sides ( 12 ) such that the bottom tubing is exposed regardless of whether it is in consumption or cleaning orientation . preferably , the inner core ( 4 ) is made of insulating material optionally , one or more stabilizing rods ( 11 ) are attached to the interior wall ( 22 ) of the inner core ( 4 ) in order to hold the core together . this is not necessary if the insulation of which the inner core is made is constructed of sufficiently rigid materials . at the top ( 20 ) is a large tab ( 1 ) that extends over the rim of the cup . this allows for easy manipulation of how the interior core ( 4 ) is aligned with the outer shell ( 8 ). the second main part of the invention is the outer shell ( 10 ). the outer shell ( 10 ) has an open top ( 25 ), a bottom ( 24 ), and walls ( 8 ), the walls are preferably insulated , enclosing a generally cylindrical central chamber ( 9 ) which is shaped and sized to tightly surround outer surface ( 32 ) of the inner core ( 4 ). the walls ( 8 ) have non - insulated cooling flanges ( 7 ) spiraling up the walls to the open top ( 20 ) at the same rate as the gap ( 6 ) of the inner core ( 4 ), so that the flanges ( 7 ) and gap ( 6 ) can be aligned , as described in detail below . the flanges ( 7 ) are preferably divided into pairs ( 26 ) and ( 27 ) with the combined diameter slightly larger than gap ( 6 ) of the inner core ( 4 ), in order to present more surface area for cooling . other arrangements with three or more divisions might be possible . as shown in fig5 , if the flange ( 7 ) is divided into two or more parallel cooling flanges , the cooling flange divisions ( 26 ) and ( 27 ) will preferably merge into one tube ( 2 ) at a point ( 14 ) immediately prior to reaching the rim of the mug ( 13 ). this tube ( 2 ) then protrudes above the top ( 20 ) of the container . the outer shell ( 10 ) also has at least one handle ( 16 ) protruding from one side . this handle can either be molded as part of the outer shell ( 10 ) or can be attached from a separate piece . the outer surface ( 32 ) of the inner core ( 4 ) and the central chamber ( 9 ) of the outer shell ( 10 ) are generally cylindrical and sized such that the inner core ( 4 ) fits tightly within the outer shell ( 10 ), but is free to rotate . in most applications it is likely that the inner surface ( 31 ) of the inner core ( 4 ) and the outside of the outer shell ( 10 ) will also be generally cylindrical , but other shapes would be possible within the teachings of the invention . in the context of this description , the term “ cylindrical ” will be understood to include cylinders with parallel walls and tapered cylinders as shown in the drawings . finally , at the top ( 25 ) of the outer shell ( 10 ) are two small tabs ( 3 ) protruding above the rim ( 13 ) and extending slightly toward the center of the mug , over the inner core ( 4 ). the tabs ( 3 ) serve to hold the inner core ( 4 ) within the outer shell ( 10 ) while allowing the inner core ( 4 ) to rotate relative to the outer shell ( 10 ) from a cleaning position ( fig1 ) wherein the flange ( 7 ) is aligned with the gap ( 6 ), to a consumption position ( fig2 ) wherein the flange ( 7 ) is aligned with the wall ( 22 ) forming a closed tube . if desired , the tabs ( 3 ) may be made small enough to allow the inner core ( 4 ) to be inserted into and removed from the outer shell ( 10 ) by the user , or they may be formed after initial assembly to be large enough to permanently lock the inner core ( 4 ) in place within the outer shell ( 10 ). when aligned for consumption ( fig2 ), tab ( 1 ) is moved to the consumption position ( 29 ). the cooling flanges ( 7 ) are sealed by the walls ( 22 ) of the inner core ( 4 ). when the user sucks at the tip ( 2 ), fluid is drawn from the exposed tubing section ( 5 ) at the bottom ( 24 ), through the sealed spiral flange ( 7 ) up to the tube ( 2 ) opening at the top ( 25 ). along the way , the hot fluid radiates heat through the thin tubing into the surrounding air , such that the fluid is less hot when it reaches the mouth . however , when tab ( 1 ) is moved to the cleaning position ( 28 ), the gap ( 6 ) of the inner core ( 4 ) is aligned with the outer shell &# 39 ; s ( 10 ) cooling flanges ( 7 ). in this position , the cooling flanges ( 7 ) are completely opened to the interior ( 23 ) of the inner core ( 4 ), allowing for easy cleaning . the small section of tube ( 2 ) at the top is short enough to effectively be cleaned without opening fully . the container of the invention can also come with a lid ( 30 ) to further keep the liquid insulated and hot until consumption and to minimize spills . the container of the invention addresses the shortcomings noted in prior art in the following ways : first , it allows immediate and continuous consumption of hot beverages . upon pouring the hot beverage into the container , the user can suck on the end of the tube ( 2 ) at the top of the cup . the liquid is drawn out of the insulated inner core ( 4 ) into the external flanges ( 7 ) where it is immediately and continuously cooled by the ambient environment while in transit to the end of the tube ( 2 ) at the top of the container . there is no waiting for the beverage to cool down in a secondary chamber , and no need to go through a cycle of filling and emptying a cooling chamber . second , unlike other straw / cup designs the cup is made easy to clean as one simply twists the inner core ( 4 ) relative to the outer shell ( 10 ) to expose the tubing . no disassembly is required . third , since the invention is formed from two parts ( the inner core ( 4 ) and outer shell ( 10 )) or three ( if the handle ( 16 ) is attached separately ) it is very cheap and easy to manufacture . no assembly is required aside from attaching a handle if that method is chosen . accordingly , it is to be understood that the embodiments of the invention herein described are merely illustrative of the application of the principles of the invention . reference herein to details of the illustrated embodiments is not intended to limit the scope of the claims , which themselves recite those features regarded as essential to the invention . 12 . material connecting the top portion of the inner core with the final ring 14 . point where the dual cooling flanges join single tube 26 . and 27 . divisions of flange ( 7 )