Abstract: The invention consists of inserting one or several cores (71) in the central straw (51) of a drinking unit, through which the beverage (21) flows to be cooled or heated, flows the fluid to be heated or cooled. By altering the flow, the core plus tube system is equivalent to a narrower and longer tube. This allows to manufacture an efficient non-coiled central straw. The straw and core characteristic of the invention can have different shapes. The core needs not have the full length of the straw. In most embodiments the core has no thermal role, but in particular cases it can contribute to the heat or cold storage. Several cores, not necessarily joined, can be used in the same straw. Core and straw or straw only can be bent and shaped in various shapes. The drinking unit can be made of an enclosure (61) containing an active or passive (11) medium delivering cold or heat. The end-pieces of the unit (81, 91) can be made to accommodate detachable extensions such as a mouthpiece or a straw extension.

Abstract: The means for raising one heel or both heels of the surfer so that the resting position of the ankle is more extended than on a flat deck. Examples of these means are a foot pad (22) thicker on one side, an asymmetrical height given to the deck of the board (24) itself, or a wedge (14) inserted between the board (10) and the pad (12).