I always admire those people who manage to complete a marathon wearing a styrofoam rhino suit (or equivalent) for charity.
Today’s invention is inspired by this but with a practical edge. Training outside in winter is unpleasant for runners. Here therefore is a light, aerodynamic plastic shell designed to keep the weather off whilst still allowing free arm and leg movement (but without the drag forces associated with running movements).
It achieves this by being attached to the wearer via a cycle helmet (blue). The shell also contains several helium-filled mylar balloons (grey) to further lessen the weight.
There would also need to be vents to regulate internal temperature. The shell itself would be a good place to carry the emblem of your charity of choice of course.